
plerrx: Draw x error bar 

DESCRIPTION:

    This function is used in example 29. 

SYNOPSIS:

plerrx(n, xmin, xmax, y)

ARGUMENTS:

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

    xmin (const PLFLT *, input) :    Pointer to array with x coordinates
    of left-hand endpoint of error bars. 

    xmax (const PLFLT *, input) :    Pointer to array with x coordinates
    of right-hand endpoint of error bars. 

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