code: def mchirp_q_to_mass1_mass2(mchirp, q):
      
      eta = conversions.eta_from_q(q)
      mass1 = conversions.mass1_from_mchirp_eta(mchirp, eta)
      mass2 = conversions.mass2_from_mchirp_eta(mchirp, eta)
      return mass1, mass2
docs: This function takes a value of mchirp and the mass ratio
      mass1/mass2 and returns the two component masses.
  
      The map from q to eta is
  
          eta = (mass1*mass2)/(mass1+mass2)**2 = (q)/(1+q)**2
  
      Then we can map from (mchirp,eta) to (mass1,mass2).