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extracting info from diff_map definition

I've defined the following diff_map

R2 = Manifold(2, 'R2', start_index=1, latex_name=r'\mathbb{R}^2')
cartesian2d.<x, y> = R2.chart()
R1 = Manifold(1, 'R1', start_index=1, latex_name=r'\mathbb{R}^1')
cartesian1d.<t> = R1.chart()
h = R1.diff_map(R2, [1-t, sqrt(2*t-t^2)])

I would like to extract the elements of the diff_map, namely 1-t and sqrt(2*t-t^2) for propose of plotting the resulting curve or for other manipulations. How can I do that?