! input file for fitobs
fitobs.
! first arc
        .astna0='101234'    ! full name, first arc
        .obsdir0='obsdata'    ! directory of observs. file, first arc 
        .elefi0='101234.arc' ! first arc elements file
        .error_model='cbm10' 

propag.
        .imet=0 !numerical method automatic choice