Disregard. I ended up using this:
#local inner_radius = earth_radius + cloud_min_radius;
#local outer_radius = earth_radius + cloud_max_radius;
#local inn_out_ratio = inner_radius/outer_radius;
density
{
spherical // spherical = 1 in the middle, 0 at the edge
color_map
{
[0.00 color rgb 0.00]
[1-(inn_out_ratio + (1-inn_out_ratio)*0.90) color rgb 1.00]
[1-(inn_out_ratio + (1-inn_out_ratio)*0.40) color rgb 1.00]
[1-(inn_out_ratio + (1-inn_out_ratio)*0.00) color rgb 0.00]
[1.00 color rgb 0.00]
}
scale outer_radius
}
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