plerry: Draw y error bar 

DESCRIPTION:

    Draws a set of n vertical error bars, the i'th error bar extending
    from ymin[i] to ymax[i] at x coordinate x[i].  The terminals of the
    error bar are of length equal to the minor tick length (settable using
    plsmin). 

SYNOPSIS:

plerry(n, x, ymin, ymax)

ARGUMENTS:

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

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

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

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