make_staircase

       Calculate a "staircase" of x and y values from input x and y
       and associated dx and dy arrays. This allows nicer plotting
       than IDL's "histogram" symbol

       Plotting

       make_staircase,x,y,dx,dy,xstair,ystair

       x  : array of original x values
       y  : array of original y values
       dx : array of dx values = halfwidth of step

       none

       none

       xstair : array of x-values of staircase
       ystair : array of y-values of staircase

       none

       none

       none

       All input arrays must be 1-dimensional and have same size

       just read it

       not needed

       Version 1.0: 1999/11/10, PK
                    first version

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