Perform sPlot in each interval

I would like to perform sPlot in the data sample to subtract the background. In my analysis, the discriminating variable is the invariant mass and the control variables are the polar angle cos theta and phi. I found that the correlation between mass and cos theta are not negligible for the background. If I want to plot the phi distribution, is it properly for me to calculate the sWeight in each cos theta bin. If I divide the data sample into several cos theta bins, can I say that the correlation between mass and cos theta can be neglected in each interval?
Thank you!

Maybe @moneta can give you an answer


Yes, if you do it bin by bin in cos(theta) and the bin width is small enough, I think you can neglect that within one bin the correlation between mass and cos(theta)

Hi, moneta and bellenot,
Thank you for your reply.

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