@sh.add_function(dsp, outputs=['phases_co2_emissions'])
def merge_wltp_phases_co2_emission(co2_emission_UDC, co2_emission_EUDC):
"""
Merges WLTP phases co2 emission.
:param co2_emission_UDC:
CO2 emission on UDC NEDC phase [CO2g/km].
:type co2_emission_UDC: float
:param co2_emission_EUDC:
CO2 emission on EUDC NEDC phase [CO2g/km].
:type co2_emission_EUDC: float
:return:
CO2 emission of cycle phases [CO2g/km].
:rtype: tuple[float]
"""
return co2_emission_UDC, co2_emission_EUDC