diff --git a/src/gray_tables.f90 b/src/gray_tables.f90
index 60cefbd..7b32377 100644
--- a/src/gray_tables.f90
+++ b/src/gray_tables.f90
@@ -115,7 +115,7 @@ contains
     type(table)                        :: tbl
 
     ! local variables
-    integer, parameter :: n_grid = 100
+    integer, parameter :: n_grid = 400
     integer :: i, n_tail
 
     real(wp_) :: rho_t, J_phi, dens, ddens