Hi Wang, How do you setup the f_grid for the y calculation? Depending on how you generate the f_grid for y, it might end up with a value that lies just a bit outside the boundary of the f_grid used for the lookup table due to slight numerical inaccuracies. These inaccuracies can be depending on your chosen step size. That could explain why it works for 2 MHz, but not for 1 MHz.
You can try to extend your lookup table grid a little bit to ensure that your new f_grid lies inside of it. Cheers, Oliver > On 21 Apr 2021, at 07:59, Wenyu Wang <wangweny...@mails.ucas.edu.cn> wrote: > > Hi Everyone, > > I had a question about caculating the impact of winds by using lookup table > in ARTS. > > > > I use the larger frequency grid when generate the table, such as 3 GHz band, > 0.5 MHz setp. However, when I caculate the y using the frequency grid with 1 > GHz band and 1 MHz step, error messages occur as follow (But it is OK when I > set the frequency step to 2 MHz): > > > > Runtime-error in source calculation at index 0: > Run-time error in agenda: propmat_clearsky_agenda > Run-time error in method: propmat_clearskyAddFromLookup > Problem with gas absorption lookup table. > At least one frequency is outside the range covered by the lookup table. > > > > The version of ARTS is 2.4.0. > > > > Regards, > > Wang > > _______________________________________________ > arts_users.mi mailing list > arts_users.mi@lists.uni-hamburg.de > https://mailman.rrz.uni-hamburg.de/mailman/listinfo/arts_users.mi
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