void gnu_end();

void gnu_start();

void cpgvstd();

void cpgtext(float xpos, float ypos, const char *label);
  
void cpglab(const char *xlbl, const char *ylbl, const char *toplbl);

void cpgimag(const float *a, int idim, int jdim, int i1, int i2, int j1, 
int j2, float a1, float a2, const float *tr);

void cpgcont(const float *a, int idim, int jdim, int i1, int i2, int j1, 
int j2, const float *c, int nc, const float *tr);

void cpgwedg(const char *side, float disp, float width, float fg, float bg, 
const char *label);

void cpgscf(int fnt);

void cpgline(int n,  const float *xpts, const float *ypts);

void cpgpt(int n,  const float *xpts, const float *ypts, int npt);

void cpgpt2(int n, int n2,  const float *x1pts, const float *y1pts, 
const float *x2pts, const float *y2pts);

void cpgline2(int n, int n2, const float *x1pts, const float *y1pts, 
const float *x2pts, const float *y2pts);

void cpgline2pt(int n, int n2, int n3, const float *x1pts, const float *y1pts, 
                const float *x2pts, const float *y2pts, 
                const float *x3pts, const float *y3pts);

void cpglinept(int n, int n2, const float *x1pts, const float *y1pts, 
const float *x2pts, const float *y2pts);

void cpgbox(const char *xopt, float xtick, int nxsub, const char *yopt, 
float ytick, int nysub);

void cpgqvp(int units, float *x1, float *x2, float *y1, float *y2);

void cpgmtxt(const char *side, float disp, float coord, float fjust, 
const char *text);

void cpgwnad(float xleft, float xright, float ybot, float ytop);

void cpgswin(float xleft, float xright, float ybot, float ytop);

void cpgsci(int lw);

void cpgslw(float lw);

void cpgsch(float lw);

void cpgsls(int lw);

void cpgsvp(float xleft, float xright, float ybot, float ytop);

void cpgenv(float xmin, float xmax, float ymin, float ymax, int just, 
int axis);

void cpgsubp(int a, int b);

void cpgpage();

int cpgopen(char *s);

void cpgend();