
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 (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. 
