.\" ############ NUTSHELL BOOK SETUP
.de book_setup
.nr nH 0	\" no numbered paragraphs
.hy 14	\" don't hyphenate last line of pg; don't split last 2 chars of a word
.nr HY 14 \" need to reset this reg if you want to change hyphenation rules
.hlm 2	\" don't hyphenate more than two lines in a row
.nr FF 4	\" use symbols (asterisk, dagger, etc) for footnotes
.		\" following lines establish footnote symbols
.ds f1 *\"			XX first footnote on page is asterisk
.ds f2 \(dg\"			XX second footnote on page is dagger
.ds f3 \(dd\"			XX third footnote on page is double dagger
.ds f4 **\"     XX fourth footnote on page is double asterisk
.ss 12 0 	\"set sentence space to null
.ad b
.nr AD \\n[.j]
.\"
.\" ############ DEFINITIONS FOR FOLLOWING
.\"		"ext" measures are from edge of physical sheet on which troff prints
.\"		"int" measures are from cutmarks
.\"		"body" refers to main text body rectangle, exclusive of header/footer
.\"
.\" ############ PRIMARY PAGE PARAMETERS
.nr pg_length_ext 11i	\" length of troff page, top to bottom
.nr pg_width_ext 8.5i	\" width of troff page, left to right
.nr top_off_ext .90625i	\" from top edge of troff page to top cutmark
.nr bot_off_ext .90625i	\" from bottom edge of troff page to bottom cutmark
.nr left_off_ext .75i	\" from left edge of troff page to left cutmark
.nr right_off_ext .75i	\" from right edge of troff page to right cutmark
.nr top_off_int .974i	\" from top cutmark to baseline of first body text
.nr bot_off_int 0.75i	\" from bottom cutmark to baseline of lowest body text
.nr left_off_int 1i	\" from left cutmark to left edge of body text
.nr body_width 5i		\" width of body text
.nr hdr_vertoff_int 0.625i	\" from top cutmark to baseline of main header text
.nr ftr_vertoff_int 0.375i	\" from bottom cutmark to baseline of main footer text
.nr hdr_leftoff 0	\" offset relative to left body margin (positive to right)
.nr hdr_rightoff 0	\" offset relative to right body margin (positive to right)
.nr ftr_leftoff 0			\" ditto
.nr ftr_rightoff 0			\" ditto
.nr chap_num_off 1.1i		\" from header text to chapter number (baselines)
.nr chap_hdr_off 0.75i		\" from chapter number to chapter head (baselines)
.nr chap_hdr_vs 26.5p		\" leading for multi-line chapter headings
.nr chap_toc_vert_off .25i	\" from baseline of header text to top of toc box
.nr chap_text_prespace 0.525i	\" from chap title to 1st text
.\"
.\" ############ MISCELLANEOUS SPACING PARAMETERS
.\" unless otherwise indicated, spaces are baseline-to-baseline
.nr PD 19p				\" space between paragraphs
.nr body_text_PD 19p 
.nr varlist_PD 17p 
.nr sidebar_PD 15p      \" space betw paras in sidebar texts
.nr itemlist_PD 17p 
.nr orlist_PD 17p
.nr QS_PD 19p 
.nr sidebar_prespace 18p  \"space before a sidebar
.\".nr sidebar_floated_prespace 8p \"space over sidebar if floats to nxt pg
.nr sidebar_postspace 16p \"space after a sidebar
.nr sidebar_title_prespace 21p \"space before a sidebar title
.nr sidebar_short_title_prespace 27p \"space before a sidebar title
.nr sidebar_title_postspace 18p \"space after a sidebar
.nr sidebar_VS 12p \"space betw lines in sidebars
.nr FPD 12p		\" space betw paras in footnotes
.nr VS 13p				\" text spacing, baseline to baseline
.nr list_prespace 19p 
.nr list_itemspace 17p 
.nr list_postspace 19p 
.\".nr list_paraspace 4p  \"space between paras within a list item
.nr list_paraspace 17p  \"space between paras within a list item
.nr Ah_need 6				\" for .ne cmd preceding Ahead
.nr Bh_need 5				\" for .ne cmd preceding Bhead
.nr Ch_need 4				\" for .ne cmd preceding Chead
.nr Dh_need 3				\" for .ne cmd predecing Dhead
.nr Ah_prespace 0.45i		\" space preceding Ahead
.nr Bh_prespace 0.4i		\" space preceding Bhead
.nr Ch_prespace 0.35i		\" space preceding Chead
.nr Dh_prespace 19.5p 
.nr Ah_postspace 0.25i		\" space following Ahead
.nr Bh_postspace 0.25i		\" space following Bhead
.nr Ch_postspace 0.25i		\" space following Chead
.nr Ah_linelength \\n[body_width]-.5i \"default line length of Ahead 
.nr Bh_linelength \\n[body_width]-.5i \"default line length of Bhead
.nr Ch_linelength \\n[body_width]-.5i \"default line length of Chead
.nr Fs_prespace 19p			\" space preceding a figure
.nr Fc_prespace 12p			\" space preceding a figure caption
.nr Fe_postspace 24p			\" space following a figure
.nr Ns_prespace 24p			\" space preceding a note
.nr Nc_postspace 19p 
.nr Ne_postspace 24p			\" space following a note
.nr Ns_need 3v				\" for .ne cmd preceding note
.nr Ps_ps 8			\" font size for screen display text
.nr Ps_vs 10p			\" space between baselines of screen display text
.nr Ps_prespace 19p		\" space preceding a screen display
.nr Pe_postspace 19p		\" space following a screen display
.nr DDS_prespace 19p		\" space preceding a non-screen display
.nr DDE_postspace 19p		\" space following a non-screen display
.nr QS_prespace .25i		\" space preceding a blockquote 
.nr QE_postspace .25i		\" space following a blockquote 
.nr QS_indent .25i			\" indent of block quotes
.nr Ts_prespace 19p		\" space preceding a table
.nr Tc_postspace 19p		\" space following a table caption
.nr Te_postspace 19p		\" space following a table
.nr informal_table_prespace 19p \" space before sgml informal table
.nr informal_table_postpace 19p \" space after sgml informal table
.nr informal_table_vs 10p \" space betw lines of informal table
.nr informal_table_ps 9 \" pointsize of font in informal table 
.nr Xs_prespace 19p		\" space preceding an example
.nr Xc_postspace 19p		\" space following an example caption
.nr Xe_postspace 19p		\" space following an example
.nr gloss_term_prespace .25i \"space before glossary item
.nr gloss_def_indent .25i	\"indent of glossary definition
.\" the standard spacings given immediately above may need to be modified for
.\" particular combinations of format elements.  To define a spacing for a
.\" particular element combination, just assign the desired spacing to a number
.\" register whose name consists of <comma><1st element>-<comma><2nd element>
.nr ,Pe-,P \\n[Pe_postspace]u
.nr ,Fe-,P 26p				\" space between figure end and new paragraph
.nr ,Li,-,Li \\n[list_itemspace]u
.nr ,LSI-,Li \\n[list_prespace]u 
.nr ,Li-,P 17p
.nr ,Le-,P \\n[list_postspace]u
.nr ,SB2-,P 26p
.nr ,Nc-,P 19p
.\"
.\" ############ INDENTATION PARAMETERS
.nr PI 0	\" indent for first line of paragraph; default indent for RS, IP
.nr Nh_space 2n			\" indent from para number to paragraph heading
.nr Ns_indent 15p			\" indent for note
.\".nr list_indent_outer 0\"	XX indent from current left margin to bullet/num
.nr number_list_indent_inner .25i	\" indent from bullet/number to list item text
.nr bullet_list_indent_inner .25i	\" indent from bullet/number to list item text
.nr varlist_indent_outer 0\"indent from current left margin to varlist item 
.nr OLlist_indent_outer 0\"indent from current left margin to varlist item 
.nr orlist_indent_inner 18p\"indent from outer indent to text after # 
.nr itemlist_indent_inner 18p\"indent from outer indent to text after # 
.nr list_indent_outer 0\"	XX indent from current left margin to bullet/num
.nr list_indent_inner 18p		\" indent from bullet/number to list item text
.nr varlist_indent .25i		\" indent for hanging label list
.nr align_on_dot 1			\" make nums in lists align on dot
.nr Ps_indent .25i			\" indent for screen displays
.nr widow_control_on 1		\"turns on widow control globally--SGML only 
.\" (the number register wcon_off turns it off for rest of page)
.\" (.ch WCD turns it off until next paragraph)
.nr DDS_indent .25i			\" indent for non-screen displays
.nr llt_indent .25i			\" indent for block displays (DDS/DDE or LLT)
.nr Xs_indent 0u			\" indent for examples
.nr Ts_indent 0u			\" indent for tables
.\"
.\" ############ FONT PARAMETERS
.nr PS 11				\" font size for main text
.nr hdr_ps 9			\" font size for page header
.ds hdr_ft TBI\"		XX font for page header
.nr footer_ps 9		\" font size for page footer
.ds footer_ft TBI\"		XX font for page footer
.ds chap_num_ft R\"		XX font for chapter number on title page
.nr chap_num_ps 96		\" font size of chapter number on title page
.ds chap_hdr_ft TBI\"	XX font for chapter header on title page
.nr chap_hdr_ps 24		\" font size for chapter on title page
.ds tocbox_ft TBI\"		XX font for text of tocbox on chapter title page
.nr tocbox_ps 10		\" font size for text of tocbox
.nr tocbox_vs 11p		\" baseline-to-baseline spacing of text in tocbox
.ds Ah_ft TBI\"		XX font for Aheads
.nr Ah_ps 18			\" font size for Aheads
.nr Ah_vs 20p			\" space between baselines of multiline Ahead
.ds Bh_ft TBI\"		XX font for Bheads
.nr Bh_ps 14			\" font size for Bheads
.nr Bh_vs 16p			\" space between baselines of multiline Bhead
.ds Ch_ft TBI\"		XX font for Cheads
.nr Ch_ps 11			\" font size for Cheads
.nr Ch_vs 13p			\" space between baselines of multiline Chead
.nr Dh_ps 10			\" font size for Dheads
.nr Dh_vs 12p	\" space between baselines of multiline Dhead
.ds Dh_ft TBI\"		XX font for Dhead
.ds Fe_ft I\"			XX font for figure captions (used also for examples)
.nr Fe_ps 9			\" font size for figure captions       "
.nr Fe_vs 11p		\" space between baselines for figure captions
.ds QP_ft I\"			XX font for quoted paragraphs
.nr QS_ps 9			\" font size for quoted sections
.nr QS_vs 11p			\" space between baselines of quoted sections
.ds QS_ft R\"			XX font for quoted sections
.nr QI .25i				\"indent for QS/QE blockquotes
.ds Ta_ft R\"			XX font for table captions and text
.ds Ta_caption_ft I\"			XX font for table captions
.nr Ta_caption_ps 9\"			XX font for table captions
.nr Ta_ps 9			\" font size for table captions and text
.nr Ta_vs 12p			\" space between baselines for tables
.nr DDS_ps 10			\" font size for non-screen display text
.nr DDS_vs 12p			\" space between baselines of display text
.nr epigraph_ps 9       \" pointsize for epigraph
.nr epigraph_vs 10p     \" space between lines for epigraph
.nr epigraph_postspace 22p \" space after an epigraph
.ie \\nz=99 .so \\*[MACRODIR]/sltmacs	\" define fonts for slt machine, syntax
.el .ds FAM T\" 	XX font family for main text
.ds cw_font_fam C\" constant width font family:  Courier
.ds special_font_fam ZD\" special font family:  Zapf-Dingbats
.\"#############INLINE FONT SPECS
.ds gloss_term_font \fB
.ds /gloss_term_font \fP
.ds citetitle_font \fI
.ds emphasis_font \fI
.ds command_option_font \fI
.ds constant_font \f[TB]
.ds interface_font \fI
.ds product_name_font \fI
.ds first_term_font \fI
.ds line_annotation_font \f[TI]
.ds computervariable_font \s'\\n[Ps_ps]'\f(CI
.ds program_name_font \fI
.ds function_font \f(CR
.ds function_param_font \f(CI
.ds function_bold_font \fB
.ds keysym_font \fI
.ds filename_font0 \fI
.ds filename_font1 \f[TBI]
.ds command_font0 \fI
.ds command_font1 \f[TBI]
.ds userinput_font0 \s-1\f(CB
.ds userinput_font1 \f(CB
.ds /userinput_font0 \fP\s+1
.ds /userinput_font1 \fP
.ds replaceable_font0 \s-1\f(CI
.ds replaceable_font1 \f(CI
.ds /replaceable_font0 \fP\s+1
.ds /replaceable_font1 \fP
.ds computeroutput_font0 \s-1\f(CR
.ds computerprompt_font1 \f(CR
.ds /computeroutput_font0 \fP\s+1
.ds /computerprompt_font1 \fP
.ds literal_fonts0b0 \s-1\f(CR
.ds literal_fonts0b1 \s-1\f(CB
.ds literal_fonts1b1 \f(CB
.ds literal_fonts1b0 \f(CR
.ds literal_ps 10\"set default to body text size
.ds literal_fnt_ps 7.5
.ds literal_tbl_ps 8.5
.ds /literal_fonts0b0 \fP\s0
.ds /literal_fonts0b1 \fP\s0
.ds /literal_fonts1b1 \fP
.ds /literal_fonts1b0 \fP
.ds tbl_head_ft \fB
.ds /tbl_head_ft \fP
.\"
.\" ############ OTHER PARAMETERS
.\" following string for use in complex numbers in figure captions, etc.
.ds dot_or_hyphen \-
.nr tocbox_shade 90			\" percent shading for box
.nr tocbox_PD 15p			\" paragraph spacing inside box
.nr tocbox_width 1.47i		\" width of box
.ds btab_font Helvetica-CondensedBold\"PostScript name of font in bleeding tab
.nr btab_pointsize 10\"pointsize of font in bleeding tab
.nr btab_number_of 5\"number of bl.tabs on page
.nr btab_long_dimension 1i\"long dimension of bl.tab 
.nr btab_short_dimension .5i\"short dimension of bl.tab on page (bleed built in)
.nr btab_first_tab_offset_from_header .2i\"meas.from headermargin
.nr btab_intertab_space .5i\"space between the tabs
.nr btab_center 1\"to center lines of text in tabs
.nr btab_align 7.75i\"distance from left edge of page to right edge of tab
.\"
.\" ############ DERIVATIVE PARAMETERS
.nr LL \\n[body_width]u	\" line length for body text
.nr LT \\n[LL]			\" length for .tl use (not necessarily used in hdrs)
.nr HM \\n[top_off_ext]+\\n[top_off_int]		\" header margin
.nr FM \\n[bot_off_ext]+\\n[bot_off_int]+1		\" footer margin
.nr PO \\n[left_off_ext]+\\n[left_off_int]		\" page offset
.ds NN \\\\n[PN]
.ds RF \\\\*[NN]
.nr hdr_vertoff \\n[top_off_ext]u+\\n[hdr_vertoff_int]u
.\" ##############TOC PARAMETERS
.nr toc_header_margin 1.8i
.nr toc_title_margin 2.4375i+\\n[top_off_ext]u
.ds toc_font_fam T
.ds toc_header_font TBI 
.ds toc_body_font TR 
.nr toc_body_leading 14p 
.ds toc_chapter_font TI 
.nr toc_chapter_leading 14p
.nr toc_header_fontsize 24 
.nr toc_chapter_fontsize 14
.nr toc_chapter_leading 16p
.nr toc_body_fontsize 10 
.nr toc_header_to_entry 1.275i
.nr toc_chapter_prespace 2P 
.nr toc_chapter_postspace 6p
.nr toc_body_prespace 6p
.nr toc_ahead_indent 4n
.nr toc_bhead_indent 8n
.nr toc_chead_indent 6n
.\" ################INDEX VARIABLES
.nr inx_col_width 2.375i
.nr inx_gutter_width .25i
.nr inx_ps 9
.nr inx_vs 11p
.\" ###############BIBLIOGRAPHY VARIABLES
.ds bibentry_title_ft \fI
.ds /bibentry_title_ft \fP
.nr bibentry_ps 10
.nr bibentry_vs 12p
.nr bibentry_prespace 16p
..
.\"
.\" ############ CHAPTERS
.\" Sidebar box: singe-ruled, with header as $1
.de SB1\"$1=title, $2=F for floating box $3=second part of title 
.\" $4=S if sidebar is short
.nr float_me 0
.nr boxtextindent 1P 
.nr boxindent 0n
.nr hastitle 0
.if "\\$2"F" \{\
.LP
.KF
.nr float_me 1
.NU\}
.SP? \\n[sidebar_prespace]u+10p
.di par*box-div
.nr \\n[.ev]:li \\n[boxindent]u+\\n[boxtextindent]
.nr \\n[.ev]:ri \\n[boxindent]u+\\n[boxtextindent]
.ll \\n(LLu
.if !"\\$1"" \{\
.ce 10
\&\s14\f[BI]\\$1\fR\s0
.if !"\\$3"" \{\
.sp 2p
\s14\f[BI]\\$3\fR\s0
.NU\}
.ce
.nr hastitle 1
.if "\\$4"S" .nr hastitle 2
.NU\}
.ll
.if "\\$1"" .SP! -1P
.if !"\\$1"" .if "\\$4"" .SP! \\n[sidebar_title_postspace]u-15p SB1
.ns
.save_nr VS \\n[sidebar_VS] itemlist_PD \\n[sidebar_PD] orlist_PD \\n[sidebar_PD] varlist_PD \\n[sidebar_PD] QS_PD \\n[sidebar_PD]
.par@reset
..
.de SB2 \"
.ie '\\n(.z'par*box-div' \{\
.	sp 1P
.   br
.	restore_nr VS itemlist_PD orlist_PD varlist_PD QS_PD
.   di
.   ds@need \\n[dn]
.   par*box-mark-top
.   ev nf
.	rs
.ie \\n[hastitle] \{\
.	if "\\n[hastitle]"1" .SP! \\n[sidebar_title_prespace]u-10p
.	if "\\n[hastitle]"4" .SP? \\n[sidebar_title_prespace]u+1.5p
.	if "\\n[hastitle]"2" .SP? \\n[sidebar_short_title_prespace]u+1.5p
.	if "\\n[hastitle]"3" .SP? \\n[sidebar_short_title_prespace]u+8.5p
.NU\}
.el .sp .5P
.   par*box-div
.   ev
.   nr \\n[.ev]:ri -(\\n[boxindent]u+\\n[boxtextindent])
.   nr \\n[.ev]:li -(\\n[boxindent]u+\\n[boxtextindent])
.   par@finish
.ps 7.5z
.ie !"\\n[boxindent]"5000" .par*box-draw \\n[boxindent]u \\n[.l]u-\\n[boxindent]u
.el .par*box-draw \\n[.i]u \\n[.l]u
.ps
.\}
.el .@error B2 without B1
.SP_reset
.SP? \\n[sidebar_postspace]u+10p SB2
.if \\n[float_me] .KE
..
.ds litquo \&"
.de GL \"Glossary Term 
.Nd 5
.SP? \\n[gloss_term_prespace]u 
.in 0
.IP "\\*[gloss_term_font]\\$1\\*[/gloss_term_font]" \\n[gloss_def_indent]u
..
.de Au \"for attributions; takes three possible lines
.sp 1P
.ad r
.ft I
\\$1
.if !"\\$2"" \{\
.br
\\$2
.NU\}
.if !"\\$3"" \{\
.br
\\$3
.NU\}
.ft
.br
.ad b
..
.\" ############ FOOTNOTES
.nr fn@sep-dist 17p 
.ev fn
.\" Round it vertically
.vs \n[fn@sep-dist]u
.nr fn@sep-dist \n[.v]
.ev
.de par*fp!4
.@PP
\&\\*[f\\$1]\h'1n'\c
..
.de par*fp!4-no
.@PP
\&\\$1\h'1n'\c
..
.\" To set the line size of footnotes correctly
.\" It's important that fn@print-sep use up exactly fn@sep-dist vertical space.
.de fn@print-sep
.ev fn
.in 0
.vs \\n[fn@sep-dist]u
.ps 5z
\D'l 1i 0'
.ps
.br
.ev
..
.\" TABLE FOOTNOTES now little raised lc letters
.ds j1 a 
.ds j2 b 
.ds j3 c 
.ds j4 d 
.ds w0 a.
.ds w1 b.
.ds w2 c.
.ds w3 d.
.ds = \\*[par@sup-start]\E*(j\\n+[stfct]\\*[par@sup-end]\"XX pick one of the footnote symbols
.ds =a \*[par@sup-start]a\*[par@sup-end]\"XX pick one of the footnote symbols
.ds =b \*[par@sup-start]b\*[par@sup-end]\"XX pick one of the footnote symbols
.ds =c \*[par@sup-start]c\*[par@sup-end]\"XX pick one of the footnote symbols
.ds =d \*[par@sup-start]d\*[par@sup-end]\"XX pick one of the footnote symbols
.ds - \\*[par@sup-start]\E*(j\\n[stfct]\\*[par@sup-end]\"XX pick one of the footnote symbols
.\" redef from tmac.gs
.am par@init \" because FL=LL in fn defaults to 5/6th of LL
.nr FL \\n[body_width]u
.nr FPS 8
.nr FVS \\n[FPS]+1
.nr FI 0
..
.de Se	\" section; $1 = section number; $2 = section name; 
.		\" $3 = 2nd part of two part title $4 = 3rd part of 3 part title
.book_setup\" set major format parameters
.set_fmt_params\" set secondary format parameters
.par@finish
.@error-recover	\" kill any diversions, keeps, nested environments (tmac.gs)
.\".als BLANK_BT BT
.\".als BLANK_PT PT
.nr last_chap_page 0
.ds RH
.if !\\n[nl]=\\n[HM] .bp
.rs
\&
.if e .bp\" get to an odd-numbered page
.rs
\&
.ft R
.nr fG 0				\" initialize figure counter
.nr xG 0				\" initialize example counter
.nr tB 0				\" initialize table counter
.rr sE
.nr newchapflag 1		\" tell PT macro we're starting a new chapter.
.ds chaptype Chapter
.if !"\\$1"" .aton \\$1 sE
.if !"\\$1"" .if !"\\g(sE"A" .nr sE \\$1
.af PN 1
.ds starting_page \\n[PN]
.if "\\$2"Preface" .af PN i
.ie r sE .ds chapternumber \\n[sE]
.el .ds chapternumber 0
.if "\\g(sE"A" .ds chaptype Appendix
.ie "\\g(sE"A" .dT .tC A \\$1 "\\$2 \\$3 \\$4"
.el .dT .tC C \\$1 "\\$2 \\$3 \\$4"
.nr notchap 0
.ds RH \\$2
.if !"\\*[LH]"" .ds book_title \\*[LH]
.if "\\*[RH]"Preface" .nr notchap 1 
.if "\\*[RH]"Index" .nr notchap 1 
.if "\\*[RH]"Glossary" .nr notchap 1 
.if !"\\$3"" .as RH \& \\$3
.if !"\\$4"" .as RH \& \\$4
.if \\n[nH] .NHx 0
.nf
.rj 50
.ft \\*[chap_num_ft]
.ps \\n[chap_num_ps]
.rs
.SP_ABS \\n[top_off_ext]u+\\n[hdr_vertoff_int]u+\\n[chap_num_off]u
\&\\$1
.if "\\$1"" .if !"\\$2"" \&\\$2
.br
.ps \\n[chap_hdr_ps]
.vs \\n[chap_hdr_vs]u
.ft \\*[chap_hdr_ft]
.ta \\n[LL]uR
.SP_ABS \\n[top_off_ext]u+\\n[hdr_vertoff_int]u+\\n[chap_num_off]u+\\n[chap_hdr_off]u
.if !"\\g(sE"" \&\\$2
.if !\\$3 \{\
.br
\&\\$3
.NU\}
.if !\\$4 \{\
.br
\&\\$4
.NU\}
.MK_ABS endofhead -1v
.nr minimum_text_start 4.74125i 
.ie \\n[endofhead]u+\\n[chap_text_prespace]u>\\n[minimum_text_start]u \{\
.	SP_ABS \\n[endofhead]u+\\n[chap_text_prespace]u
.NU\}
.el .SP_ABS \\n[minimum_text_start]u
.br
.vs \\n[Ah_vs]u
.ad b
.lg 0
.RT
.ns
..
.de PT
.ev pt
.po \\n(POu+\\n[hdr_leftoff]u+\\n[hdr_rightoff]u
.in 0
.ft \\*[hdr_ft]
.ps \\n[hdr_ps]z
.lt \\n[LT]u
.SP_ABS \\n[top_off_ext]u+\\n[hdr_vertoff_int]u-4p
.if e \{\
.ie !\\n[last_chap_page] \{\
.ie \\n[notchap] .tl \\*[NN]\\*[RH]
.el .tl \\*[NN]\\*[RH]
.ft R
.ps 7.5z	\" so following \D line will be a hairline
.SP_ABS \\n[top_off_ext]u+\\n[hdr_vertoff_int]u
\D'l \\n[LT]u 0'
.NU\}
.el .SP_ABS \\n[top_off_ext]u+\\n[hdr_vertoff_int]u
.ps
.NU\}
.fl
.po
.ev
.if \\n[cM] .CM pagetop
..
.de BT	\" invoked from footer trap (see pg@top & pg*footer macros in tmac.gs)
.ev pt
.vpt 0
.if \\n[bT] .if o .b0	\" invoke bleeding tabs, if any
.vpt 1
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