cwt of specific frequencies

[Marius 't Hart]

 Hi all,

I have EEG data and I'm trying to do steady state visual evoked potentials, or "frequency tagging". To see how much of each of the frequencies I used is present in the signal over time, I'd like to use morlet wavelets. However, I only need 3 specific frequencies and I don't get how to specify this in mlpy's cwt. Can anyone help?

Thanks!
Marius