Hi Mattia, hi Pengwang,

Thanks Mattia for helping out. :-)

Since you were referring to Richard's earlier post, I'll take this opportunity 
to point out the searchable archive of this list, which might come in handy at 
times:

https://www.mail-archive.com/arts_users.mi@lists.uni-hamburg.de/

Here is the post Mattia was referring to:

https://www.mail-archive.com/arts_users.mi@lists.uni-hamburg.de/msg00471.html

Cheers,
Oliver


> On 10 Feb 2022, at 17:38, mattia.sabat...@artov.ismar.cnr.it wrote:
> 
> Pengwang,
> 
> sorry for my partial answer. Recently I compiled ARTS 2.5 and I had a similar 
> issue concerning the absorption lookup table. Richard Larsson, helped me 
> replying to my mail sent in this mailing list, suggesting to add 
> abs_xsec_per_speciesAddLines into my cross-section agenda.
> 
> He also added:
> 
> "We are currently in a transition in the 2.5-branch of moving away from 
> abs_xsec_agenda entirely.  There are some lingering problems when using 
> lookup table calculations at this time.  Mainly, since the line calculations 
> should happen in propmat_clearsky_agenda now, they are not part of any of the 
> default cross-section agendas as in the past.  The lookup generation 
> interface is currently under active development, so this interface might 
> change in the near future."
> 
> Best regards,
> Mattia
> 
> 
> 
> 
> 
> Pengwang Zhai <pwz...@umbc.edu> ha scritto:
> 
>> Thanks, Mattia. Would you advise how TestAbs.arts can be revised to include 
>> line-by-line calculation?
>> 
>> Note that the behavior of TestAbs.arts is different in arts2.3, which does 
>> calculate line-by-line absorption coefficients.
>> 
>> I do not want continua, as I am mainly interested in the visible spectra, 
>> which is out of most of those continuum models. Based on my experience with 
>> previous arts version, arts does not check the spectrum limits for the 
>> continuum models. I am not sure whether arts 2.5 has been improved on this.
>> 
>> Pengwang
>> 
>> 
>> 
>> 
>> 
>> 
>>> On Feb 10, 2022, at 9:46 AM, mattia.sabat...@artov.ismar.cnr.it wrote:
>>> 
>>> Hi Pengwang,
>>> 
>>> the controlfile TestAbs.arts, in line 15, has the following:
>>> Copy(abs_xsec_agenda, abs_xsec_agenda__noCIA)
>>> 
>>> I checked in controlfiles/general/agendas.arts for what 
>>> abs_xsec_agenda__noCIA does:
>>> AgendaCreate( abs_xsec_agenda__noCIA )
>>> AgendaSet( abs_xsec_agenda__noCIA ){
>>> abs_xsec_per_speciesInit
>>> abs_xsec_per_speciesAddConts
>>> }
>>> 
>>> Therefore the agenda calculates absorption for continua tag only (see 
>>> https://atmtools.github.io/arts-docs-master/docserver/methods/abs_xsec_per_speciesAddConts.html).
>>>  You selected H2O, and by doing this my guess is that you are not 
>>> considering continuum, as it is written in lines 36-37 of TestAbs.arts.
>>> 
>>> I hope that this will help you,
>>> 
>>> Mattia
>>> 
>>> 
>>> Pengwang Zhai <pwz...@umbc.edu> ha scritto:
>>> 
>>>> Hello, ARTS community,
>>>> 
>>>> I downloaded and compiled the latest version of arts. Now I tested the the 
>>>> creation of abs_lookup with the example control file located in:
>>>> 
>>>> arts/controlfiles/artscomponents/absorption/TestAbs.arts
>>>> 
>>>> I only modified two occurrences of:
>>>> 
>>>> abs_speciesSet( species=[ "H2O-PWR98",
>>>>                         "O2-PWR93",
>>>>                         "N2-SelfContStandardType" ] )
>>>> 
>>>> to:
>>>> 
>>>> abs_speciesSet( species=[ "H2O" ] )
>>>> 
>>>> and run
>>>> 
>>>> arts TestAbs.arts
>>>> 
>>>> The resultant abs_lookup are all ZEROs.
>>>> 
>>>> Any help?
>>>> 
>>>> More background information: I used arts 2.3 to create abs_lookup for H2O, 
>>>> CO2, etc. in the visible by reading from HITRAN 2012. The baseline example 
>>>> was TestAbs.arts provided by the arts installation. Now I need to revisit 
>>>> the calculation based on HITRAN 2020, and the lookup table calculation 
>>>> seems not working with arts 2.5. I greatly appreciate it if you could 
>>>> provide a working example on how to create a abs_lookup with arts 2.5.
>>>> 
>>>> Pengwang

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