diff --git a/tests/grib_grid_lamb_az_eq_area.sh b/tests/grib_grid_lamb_az_eq_area.sh
index f2e8e3bd6..206b1623f 100755
--- a/tests/grib_grid_lamb_az_eq_area.sh
+++ b/tests/grib_grid_lamb_az_eq_area.sh
@@ -8,7 +8,7 @@
 # virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 
 . ./include.sh
-#set -x
+
 
 GRIB_INFILE=${data_dir}/regular_gaussian_pressure_level_constant.grib2
 REF_FILE=grib_lamb_az_eq_area.ref
@@ -19,20 +19,23 @@ GRIB_OUTFILE=lamb_az_eq_area.grib2
 DATA_OUTFILE=lamb_data.txt
 rm -f $FILTER_FILE $GRIB_OUTFILE $DATA_OUTFILE
 
+# Spherical Earth
+# ----------------
+
 # Create a filter
 cat > $FILTER_FILE<<EOF
-set edition=2;
-set gridType="lambert_azimuthal_equal_area";
+set edition = 2;
+set gridType = "lambert_azimuthal_equal_area";
 set Nx = 10;
 set Ny = 10;
-set values={2};
-set numberOfDataPoints=100;
+set values = {2};
+set numberOfDataPoints = 100;
 
-set shapeOfTheEarth=1; # Earth assumed spherical with radius specified (in m) by data producer 
-set scaleFactorOfRadiusOfSphericalEarth=0;
-set scaledValueOfRadiusOfSphericalEarth=6378388;
+set shapeOfTheEarth = 1; # Earth assumed spherical with radius specified (in m) by data producer 
+set scaleFactorOfRadiusOfSphericalEarth = 0;
+set scaledValueOfRadiusOfSphericalEarth = 6378388;
 
-set numberOfValues=100;
+set numberOfValues = 100;
 set latitudeOfFirstGridPointInDegrees = 67.575;
 set longitudeOfFirstGridPointInDegrees = 326.5056;
 set Dx = 5000000;
@@ -45,11 +48,8 @@ EOF
 # Use this filter and the input GRIB to create a new GRIB
 rm -f "$GRIB_OUTFILE"
 ${tools_dir}/grib_filter -o $GRIB_OUTFILE $FILTER_FILE $GRIB_INFILE
-if [ ! -f "$GRIB_OUTFILE" ]; then
-   echo Failed to create output GRIB from filter >&2
-   exit 1
-fi
-# Now get the data from the newly created GRIB file
+
+# Now run the Geoiterator on the newly created GRIB file
 ${tools_dir}/grib_get_data $GRIB_OUTFILE > $DATA_OUTFILE
 
 # Compare output with reference. If the diff fails, script will immediately exit with status 1
@@ -62,6 +62,36 @@ grib_check_key_equals $GRIB_OUTFILE xDirectionGridLengthInMetres,yDirectionGridL
 ${tools_dir}/grib_ls -l 67,-33,1 $GRIB_OUTFILE
 
 
+# Oblate spheroid
+# --------------------
+
+cat > $FILTER_FILE<<EOF
+set edition = 2;
+set gridType = "lambert_azimuthal_equal_area";
+set Nx = 10;
+set Ny = 10;
+set values = {2};
+set numberOfDataPoints = 100;
+
+set shapeOfTheEarth = 4; # Earth assumed oblate spheroid
+
+set numberOfValues = 100;
+set latitudeOfFirstGridPointInDegrees = 67.575;
+set longitudeOfFirstGridPointInDegrees = 326.5056;
+set Dx = 5000000;
+set Dy = 5000000;
+set standardParallel = 48000000;
+set centralLongitude = 9000000;
+write;
+EOF
+
+# Use this filter and the input GRIB to create a new GRIB
+rm -f "$GRIB_OUTFILE"
+${tools_dir}/grib_filter -o $GRIB_OUTFILE $FILTER_FILE $GRIB_INFILE
+
+${tools_dir}/grib_get_data $GRIB_OUTFILE
+
+
 # Clean up
 rm -f $FILTER_FILE $DATA_OUTFILE
 rm -f $GRIB_OUTFILE