Question: Legend for surfdata

 How to insert legends in the surfdata?

plots:-surfdata({Mat1}, ll1 .. ul1, ll2 .. ul2, dimension = 2, colorscheme = ["Blue", "Green", "Yellow", "Red"], axes = boxed, axesfont = [TIMES, BOLD, 16], axis = [thickness = 2], labelfont = [TIMES, BOLD, 16], labels = ["R", "Ma"])
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