code: def calcMhFromMz(mz, charge):
      
      mh = (mz * charge) - (maspy.constants.atomicMassProton * (charge-1) )
      return mh
docs: Calculate the MH+ value from mz and charge.
  
      :param mz: float, mass to charge ratio (Dalton / charge)
      :param charge: int, charge state
  
      :returns: mass to charge ratio of the mono protonated ion (charge = 1)