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The final statement of a counting do loop should have the loop index as comment as in:
do i3=m3,n3
do i2=m2,n2
do i1=m1,n1
rho(i1,i2,i3)=model%rho(i1,i2,i3)
end do
! i1
end do
! i2
end do
! i3
Long if..then..else constructs can have the branching condition (or an abbreviated version)
as comment after the endif statement as in the (very short) example:
if (Copyrho_flag) then
rho(m1:n1,i2,i3)=model%rho(m1:n1,i2,i3)
endif
! (Copyrho_flag)