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Rotating frame transformation with respect to a specified group of spins to specified order in perturbation theory. Syntax:



   C      - carrier Hamiltonian with respect to which the
            rotating frame transformation is to be done
   H      - laboratory frame Hamiltonian H0+H1 that is to
            be transformed into the rotating frame 
   isotope - string, such as '1H', specifying the spins
             with respect to which the transformation is
             being computed
   order   - perturbation theory order in the rotating
             frame transformation