[Geology2] how to draw isopleths in perplex

hai, am MSc student from pondicherry university,i am now working on PT path studies of SGT India,. i made pseudosections using PeRpLeX 6.6.7..but i have no idea how to make isopleths in perplex.So can anybody please tel me how to plot isopleths in the pseudosection map in Perplex?

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