When the map is in split mode, the layers of the two variable to be compared should not overlay each other. The reason is that transparent regions in the 2nd variable will display same portions of the 1st and this makes it hard interpreting what quantity is currently visualised.
When the map is in split mode, the layers of the two variable to be compared should not overlay each other. The reason is that transparent regions in the 2nd variable will display same portions of the 1st and this makes it hard interpreting what quantity is currently visualised.