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Hi admin,
When I use the command as follow, a mistake shows, "gpsh: negative or null value for Qp at layer 0".
I don't know what had happened. Could you help me?

Your file does not contain any information about attenuation values (Qp and Qs).
You can add them for each layer in your file as explained in help (gpsh -h) or globally with options Qp and Qs.