In CLASS, the brightness scale is assumed to be expressed in
when the forward and beam efficiencies are equal. To check
this, you can type
LAS> EXAMINE R%HEAD%CAL%BEEFF R%HEAD%CAL%FOEFF R%HEAD%CAL%BEEFF = 0.9600000 ! Real GLOBAL RO R%HEAD%CAL%FOEFF = 0.9600000 ! Real GLOBAL ROIn this case, if the source properties are better represented by the main temperature scale (
LAS> EXAMINE R%HEAD%HER%ETAL R%HEAD%CAL%FOEFF ! Check that they have identical values R%HEAD%HER%ETAL = 0.9600000 ! Real GLOBAL RO R%HEAD%CAL%FOEFF = 0.9600000 ! Real GLOBAL RO LAS> EXAMINE R%HEAD%HER%ETAMB ! Check that the beam efficiency is sensible R%HEAD%HER%ETAMB = 0.6223738 ! Real GLOBAL RO LAS> MODIFY BEAM_EFF R%HEAD%HER%ETAMB ! Scale conversion I-MODIFY, Former beam efficiency: 0.9600, new: 0.6224The MODIFY BEAM_EFF command will multiply the spectrum by R%HEAD%CAL%FOEFF / R%HEAD%HER%ETAMB and change the associated header parameters accordingly, e.g. baseline rms and