diff --git a/data/config-nb.ini b/data/config-nb.ini
index 9b94756..4f1f7ab 100644
--- a/data/config-nb.ini
+++ b/data/config-nb.ini
@@ -8,12 +8,13 @@ psize=Psize.dat
 hires_step=0.5
 
 [out]
+margin=0.005
 no_breakwater=True
 root=out_nb
 sub=bathy_sub.npy
 out=bathy.npy
 step=1
-left=0
+left=-300
 right=150
 
 [artha]
diff --git a/data/processing/projection.py b/data/processing/projection.py
index 8e4f3ca..0aa1e16 100644
--- a/data/processing/projection.py
+++ b/data/processing/projection.py
@@ -91,13 +91,14 @@ x_min_hires = x[z_crossing] + (bathy_hires[:, 0].min() - bathy_hires[hires_cross
 x_max_hires = x[z_crossing] + (bathy_hires[:, 0].max() - bathy_hires[hires_crossing, 0])
 log.debug(f"Replacing range: [{x_min_hires},{x_max_hires}]")
 
-flt_x = (x > x_min_hires) & (x < x_max_hires)
 hstru = np.zeros(z.shape)
 poro = np.zeros(z.shape)
 psize = np.zeros(z.shape)
 if config.getboolean("out", "no_breakwater", fallback=False):
-    z[flt_x] = z[flt_x][-1]
+    flt_x = np.abs(x) < 250
+    z[flt_x] = np.linspace(z[flt_x][0], z[flt_x][-1], flt_x.sum())
 else:
+    flt_x = (x > x_min_hires) & (x < x_max_hires)
     z[flt_x] = interpolate.griddata(
         (bathy_hires[:, 0],),
         bathy_hires[:, 1],