deletions | additions       diff --git a/background.tex b/background.tex  index 39770f6..cb2db1f 100644  --- a/background.tex  +++ b/background.tex 
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describe various signal regions    account for differences in data and MC by applying scale factor (scale = data / total MC)   $\ki^2$ $\xi^2$  test tells us that the there is a 47\% probability the 200-450 numbres are around a central value and a 96\% probably for the 500,550 total pred = scale * non 2:1 + 2 * dataEmuSum/2.01