code: def kms_to_kpcGyrDecorator(func):
      
      @wraps(func)
      def kms_to_kpcGyr_wrapper(*args,**kwargs):
          return func(args[0],velocity_in_kpcGyr(args[1],1.),args[2],**kwargs)
      return kms_to_kpcGyr_wrapper
docs: Decorator to convert velocities from km/s to kpc/Gyr