diff --git a/src/gray_core.f90 b/src/gray_core.f90
index db73a26..5a2add2 100644
--- a/src/gray_core.f90
+++ b/src/gray_core.f90
@@ -237,7 +237,7 @@ contains
           do jk=1,params%raytracing%nray
             ! Save the step "zero" data
             call store_ray_data(params, equil, results%tables,      &
-              i=0, jk=jk, s=stv(jk), P0=one, pos=yw(1:3,jk),        &
+              i=0, jk=jk, s=stv(jk), P0=p0jk(jk), pos=yw(1:3,jk),   &
               psi_n=-one, B=zero, b_n=[zero,zero,zero], k0=ak0,     &
               N_pl=zero, N_pr=zero, N=yw(4:6,jk), N_pr_im=zero,     &
               n_e=zero, T_e=zero, alpha=zero, tau=zero, dIds=zero,  &