I am trying to select the OII emitters from the colour-colour diagram of galaxies data. I don't know how to select those candidates which are above the line. Here is my colour-colour diagram. . What I want is to select those candidates which are above the lines like this. . This is from Hayashi+10 paper
I am new to python. I would be very grateful if anyone helps me how to select the candidates above a line(in sample code. In general also, if we have a plot and I want to select those points which are above a line, how to do it).