Remove the local τm parameter from a model.
spin_id: The spin identification string.
This function will remove the local τm parameter from the model-free parameter set. If there is no local τm parameter within the set nothing will happen.
If no spin identification string is given, then the function will apply to all spins.
The following command will remove the parameter `tm':
[numbers=none] relax> model_free.remove_tm()