Index: LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90
===================================================================
--- LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 3622)
+++ LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 3623)
@@ -704,4 +704,5 @@
 
        IF (vars_defined) THEN
+          missing_val=missing_val_nf90
           DO k = 1, kmax_100m                                      !--we could stop much lower
             zrho(:) = pplay(:,k)/t_seri(:,k)/RD                    ! air density in kg/m3