I would like to plot a set of lines where the color of each line is
parametrized.  Then I want to add a colorbar to the plot.

For example, suppose I plot y=x+b for various values of b.  For each
line, I would like to set the color to a particular value of b.  When
plotting, all b values are normalized and applied to a colormap.  The
colormap will show all colors...

I can create a LineCollection containing all my lines...but I must
specify the colors as RGB tuples....and I haven't figured out how to
add a colorbar such that the scale on the colorbar will match the
parametrized b values.

Ideas?

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