
plerry: Draw y error bar 

DESCRIPTION:

    This function is used in example 29. 

SYNOPSIS:

plerry(n, x, ymin, ymax)

ARGUMENTS:

    n (PLINT, input) :      Number of error bars to draw. 

    x (const PLFLT *, input) :      Pointer to array with x coordinates of
    error bars. 

    ymin (const PLFLT *, input) :    Pointer to array with y coordinates
    of lower endpoint of error bars. 

    ymax (const PLFLT *, input) :    Pointer to array with y coordinate of
    upper endpoint of error bar. 
