diff --git a/moduleOutput.f90 b/moduleOutput.f90
index 1602bb0..b2d5fc7 100644
--- a/moduleOutput.f90
+++ b/moduleOutput.f90
@@ -145,8 +145,11 @@ module output
       character(len=10) :: ZString
 
       do j = 1, nz
+        if (all(n_i(j,i)*n_ref < 1.0e-16_dp)) then
+          cycle
+        end if
         write (timeString, formatTime) t
-        write(ZString, '(F6.3)') Z_list(j)
+        write(ZString, '(F6.1)') Z_list(j)
         ZString = adjustl(trim(ZString))
 
         ZString = adjustl(ZString)
@@ -278,8 +281,11 @@ module output
 
 
       do j = 1, nz
+        if (all(f(j,:)*n_ref/u_ref < 1.0e+20_dp)) then
+          cycle
+        end if
         write (timeString, formatTime) t
-        write(ZString, '(F6.3)') Z_list(j)
+        write(ZString, '(F6.1)') Z_list(j)
         ZString = adjustl(trim(ZString))
 
         ZString = adjustl(ZString)