Graph Builder: reference line, different for each Y group
Hello everybody, I would like to know if it is possible to define separated reference lines on the X axis when we have Y groups.Here is an example using the BigClass data table.I can define two reference lines, but I would like to display the red one only on the top graph and the blue one on the bottom graph. Here is what I get: Here is what I would like to get: Is there a way to do that without p...