#h      diff    accum
0.0     0
00.000938       0.000938
00.001611       0.002549
00.001736       0.004285
00.002006       0.006291
00.002049       0.00834
#  | /home/johnh/BIN/DB/dbrow 
#  | /home/johnh/BIN/DB/dbcol diff
#  | dbsort diff
#  | dbrowaccumulate -c diff