====== Show cut value as a line in a histogram ======
{{rootCutLine.png?200}} To create a line in a histogram for example to indicate a cut do the following in your python root macro and in the canvas where you have the histogram:
<code>
cutObj = TLine(XcutValue, hist.GetMinimum(), XcutValue, hist.GetMaximum())
cutObj.SetLineColor(kGreen+2)
cutObj.SetLineWidth(2)

cutObj.Draw("lsames")
</code>

====== Highlight an area in a histogram ======
{{rootCutArea.png?200}}
<code>
cutObj2 = TBox(X1Value, hist.GetMinimum(), X2Value, hist.GetMaximum())
cutObj2.SetFillColor(kRed-4)
cutObj2.SetFillStyle(3003) #hatching
cutObj2.SetLineWidth(0)
cutObj2.Draw("lsames")
</code>