At stockcharts when I set the PPO (5,10,X) changing X gives you different values for the Histogram (I tried X=3 X=5 X=9 X=15).
The following is from the Stockcharts glossary showing a PPO (12,26,9) "The PPO-Histogram shows the difference between the PPO and the 9-day EMA of the PPO. The plot is presented as a histogram so that centerline crossovers and divergences are easily identifiable."
Changing the X value will plot an X-day EMA of the PPO.
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