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Ticks formatter rounding

Hi all,

On sage 10.0, the code

var('x,y')
f(x,y) = sqrt(x^2 + y^2)
C = contour_plot(f ,(-0.2,0.2), (-0.2,0.2), axes = True, cmap = "Spectral", 
            labels = True,  label_fmt=lambda x: "$%s$"%round(x,2), label_colors="black", 
            label_inline=True,
            label_fontsize=16,
            gridlines=True, axes_labels=["$x$","$y$"],
            ticks = [[-0.2,-0.1,0,0.1,0.2],[-0.2,-0.1,0,0.1,0.2]],
            tick_formatter = "latex", fontsize= 16)

produces a figure in which the ticks markers are more like -0.200000000000, see the figure. I cannot figure out how to print a nice -0.2 (using latex) instead.

Any ideas? Thanks in advance!

image description