Hi René,

> Forward model:
> - the remaining difference between the forward model is highly
> correlated with vmr at surface (corr=0.98)

Interesting. Probably caused by a slight difference in interpolation 
between the versions. Probably not of any practical concern. ARTS-2 
should be better, things done more carefully.

>
> Retrieval:
>    - the qpack2 retrieval seems to converge better than qpack1. With
> Qpack2 511 of 511 cases converged, with Qpack1 only 434 of 511.  The
> number of iterations tends to be higher for Qp1.
>    - an interesting fact concerning Qp1:  if I use the old iteration_ok
> condition  (iteration=ok if 1 | cost_new<  cost_old) instead of the
> correct one (iteration=ok if cost_new<  cost_old), all cases converged.

Great to see that things are working better now. There appears to be a 
small problem when mapping an x-vector back to arts-1.

>
> QPack-doc:
> - in sections 6.1.2 and 7.1, Q.T_ATMDATA should be changed to Q.T.ATMDATA

Fixed.

Thanks for the report,

Patrick
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