The documentation is pretty clear
There is no MIDPOINT option in PROC GCHART
There is a MIDPOINTS= option, maybe that is what you want?
Gchart midpoints= option would look like
midpoints=(30 40 50)
where there is a list of values that you want to be the midpoint of the bars on the axis.
OR
midpoints=OLD if you want to use the Nelder algorithm for determining default midpoint values from the values of a numeric variable used for the axis
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