A BARCHART by design always includes the zero baseline in the plot. SCATTERPLOT does not. So, Bar Chart is not likely the best plot to use for this graph as it can be misleading to have a baseline other than zero.
However, if you must, then you can find the min value and save it in a macro variable, and then set the Y axis ViewMin value to this value: " yaxisopts=(linearopts=(viewmin=&minp50)) "
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