Some Additional band in dEdx vs p distribution in AuAu 200 RFF

I see some additional band in dEdx vs p distribution in AuAu 200 RFF(the left down corner).

Because there are some bad run found in dEdx around day 146~149. I trace the source of this band.

There is an integral of the counts in a window around the band devide by total counts in this p window run by run.

And we can see at run 146~149 it gives a high peak and also run 140~145 it gives a lower peak. Run 146~149 has

been already marked as bad runs due to high noise level with pulser on.

And Also dEdx gain for inner and outer sector vs run