issue running wgbstools mix_pat

[tomh1lll]

I am attempting to run mix_pat to make different proportions of test data for wgbstools and UXM, but keep hitting the same issue.
When I run the command:

wgbstools mix_pat --rates [[0.0, 1.0] [0.0, 1.0]] GSM5652176_Adipocytes-Z000000T7.hg38.pat.gz GSM5652313_Blood-Granulocytes-Z000000TZ.hg38.pat.gz

I get the following errors:

mix_pat: error: argument --rates: invalid float value: '[[0.0,'

I consistently get this error no matter how I put the rate values & with or without the square brackets.