First, select the kind of section (X and Y for vertical longitude and latitude section, Z for horizontal section).
Then choose the coordinate of the section plane (the min value is taken into account) and the fitted zoom. Note that default values are bounding.
Once this is done, select the type of data (monthly, seasonly or climatic fields and the month or season if required) and the nature of data.
To get more or less accurate results, change the number of isolines as wanted.
It takes a few minutes to create the section ... Be patient !