the initial temperature in my model is changing with depth, (in direction Z). when I open the file initfi.f,

i add a line: " T(X,Y,Z)=300+0.1*Z "in the subroutine.

any one tell me

what's the meanings of the following lines?

EQUIVALENCE( UDAT12(001), ICTID )

EQUIVALENCE( UDAT03(001), CON )

EQUIVALENCE( UDAT03(020), F2 )

EQUIVALENCE( UDAT03(021), F4 )

EQUIVALENCE( UDAT03(022), F6 )

EQUIVALENCE( UDAT04(001), CP )

EQUIVALENCE( UDAT04(002), DEN )

EQUIVALENCE( UDAT04(062), VISM )

EQUIVALENCE( UDAT04(063), VIST )

EQUIVALENCE( UDAT04(067), X )

EQUIVALENCE( UDAT04(068), Y )

EQUIVALENCE( UDAT04(069), Z )

They just make other information available for you. Don't worry too much about how this works. You can see the meaning of each item in the nom.inc file.

thank you