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"*" will choose the appropriate (or preferred, can't remember the exact wording) protocol for your card and works with T=CL. Think of it as a wildcard protocol.
the T=n notation is defined in ISO 7816. Only T=0 to T=15 is possible and usable in an ATR.
so, T=CL does not exist, it does not mean anything. The real protocol is ISO14443-4, which is very similar to T=1.
In practice, contactless readers use T=1, even if some of them emulate/advertise a T=0 protocol.
The best way to go is, as explained by Shane, to use the wildcard protocol.
thanks a lot for the replies :D