Question: Values from graph and max from the sets.

Just a simple histogram, but how do I select the values from the graph. 

op(b) pulls out the data of the graph

POLYGONS([[1., 0], [2., 0], [2., 1], [1., 1]], [[2., 0], [3., 0], [3., 0], [2., 0]], [[3., 0], [4., 0], [4., 1], [3., 1]], [[4., 0], [5., 0], [5., 2], [4., 2]], [[5., 0], [6., 0], [6., 1], [5., 1]], [[6., 0], [7., 0], [7., 1], [6., 1]], [[7., 0], [8., 0], [8., 1], [7., 1]], [[8., 0], [9., 0], [9., 4], [8., 4]], COLOUR(HSV, .5476190475, 1.000000000, .7000000000))

I can't figure out how to pull the max of the 2nd position in each set.

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