Dqf cosy.m

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Phase-sensitive double-quantum filtered COSY pulse sequence. Syntax: 

              fid=dqf_cosy(spin_system,parameters,H,R,K)

where H is the Hamiltonian commutation superoperator, R is the relaxa- tion superoperator, K is chemical kinetics superoperator and the output has fid.cos and fid.sin fields to facilitate subsequent hypercomplex processing. The following parameters are required: 

 parameters.sweep              sweep width in Hz

 parameters.npoints            number of points for both dimensions

 parameters.spins              nuclei on which the sequence runs,
                               specified as '1H', '13C', etc.
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