Canvas#drawFieldContour

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/** Use to color a grid according to its values. High values are colored in
* a brighter color.
* @param {Grid2D|CoarseGrid} [cc] - the grid to draw values for. If left
* unspecified, the grid that was originally supplied to the Canvas
* constructor is used.
* @param {number} [nsteps = 10] - the number of contour lines to draw.
* Contour lines are evenly spaced between the min and max log10 of the
* chemokine.
* @param {HexColor} [col = "FFFF00"] - the color to draw contours with.
* */
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