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7 Command file: Specifying variance structures 132blrowvariety 25yieldbarley.asd !skip 1 !OWN MYOWN.EXEy ∼ va1 210 0 AR1 .115 0 OWN2 .2 .1 !TRRThe file written by ASReml has extension .own and looks like15 2 10.6025860D+000.1164403D+00This file was written by asreml for reading by yourprogram MYOWNGDGasreml writes this file, runs your program and then readsshfown.gdgwhich it presumes has the following format:The first lines should agree with the top of this filespecifying the order of the matrices ( 15)the number of variance parameters ( 2)and a control parameter you can specify ( 1).These are written in (3I5) format. They are followed bythe list of variance parameters written in (6D13.7) format.Follow this with 3 matrices written in (6D13.7) format.These are to be each of 120 elements being lower trianglerow-wise of the G matrix and its derivatives with respectto the parameters in turn.This file contains details about what is expected in the file written by yourprogram. The filename used has the same basename as the job you are runningwith extension .own for the file written by ASReml and .gdg for the fileyour program writes. The type of the parameters is set with the !T qualifierdescribed below. The control parameter is set using the !F qualifier.– !F2 applies to OWN models. With OWN, the argument of !F is passed to theMYOWNGDG program as an argument the program can access. This is themechanism that allows several OWN models to be fitted in a single run.– !Ts is used to set the type of the parameters. It is primarily used in conjunctionwith the OWN structure as ASReml knows the type in other cases.The valid type codes are as follows: