rest_to_obs# madcubapy.utils.rest_to_obs(rest_freq, radial_velocity, doppler_convention='radio')[source]# Convert rest frequency to observed frequency. Parameters: rest_freqQuantityRest frequency. radial_velocityQuantityRadial velocity of the source relative to the observer. doppler_convention{“radio”, “relativistic”}, default: “radio”The Doppler convention to use. Returns: obs_freqQuantityObserved frequency.