diff --git a/src/tracers.jl b/src/tracers.jl
index f87ddf9..0c321be 100755
--- a/src/tracers.jl
+++ b/src/tracers.jl
@@ -29,7 +29,8 @@ Returns:
 """
 NumberCountsTracer(cosmo::Cosmology, z_n, nz; 
     b=1.0, res=1000, nz_interpolation="linear") = begin
-    z_w, nz_w = nz_interpolate(z_n, nz, res)
+    z_w, nz_w = nz_interpolate(z_n, nz;
+        res=res, mode=nz_interpolation)
     nz_norm = integrate(z_w, nz_w, SimpsonEven())
     
     chi = cosmo.chi(z_w)
@@ -64,7 +65,8 @@ WeakLensingTracer(cosmo::Cosmology, z_n, nz;
     IA_params = [0.0, 0.0], m=0.0,
     res=350, nz_interpolation="linear") = begin
     cosmo_type = cosmo.settings.cosmo_type
-    z_w, nz_w = nz_interpolate(z_n, nz, res)
+    z_w, nz_w = nz_interpolate(z_n, nz;
+        res=res, mode=nz_interpolation)
     res = length(z_w)
     nz_norm = integrate(z_w, nz_w, SimpsonEven())
     chi = cosmo.chi(z_w)
diff --git a/test/test_output.npz b/test/test_output.npz
index 85de885..09404cf 100644
Binary files a/test/test_output.npz and b/test/test_output.npz differ