Dear mailing list,

Using the ARTS forward model to simulate a ground-based sensor I am looking to 
obtain total Transmission values (in %) in addition to Brightness Temperature 
values. ARTS leads me to believe I can do this using iy_aux_vars where in the 
documentation it states that "Transmission, total" is a valid option when I use 
ycalc  - http://www.sat.ltu.se/arts/docserver-stable/variables/iy_aux_vars

I'm having trouble with the syntax in q_pack2, when I include

Q.IY_UNIT             = 'PlanckBT';
Q.YCALC_WSMS          = { 'yCalc' };
Q.IY_AUX_VARS           = { 'Transmission' }

to the code it complains that, 'For calculations using yCalc, *iy_aux_vars* can 
not include variables of along-the-path or extinction matrix type.' but when I 
add 'Total' like it suggests in the documentation

Q.IY_AUX_VARS           = { 'Transmission', 'Total' }

it complains that, 'In *iy_aux_vars* you have included: "Total". This choice is 
not recognized.'

Can someone help me?

Many thanks
Emma

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