How to modify ana_initial.F?

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How can I modify these requirements? I have modified the cppdefs.h, ana_grid.F and param.h as requested in the document. However, I have no idea how to modify ana_initial.F. Can someone tell me how to modify it？

I have defined the CONVECTION in cppdefs.h and ana_grid.F. But I don't know how to set up the initial fields.