diff --git a/CMakeLists.txt b/CMakeLists.txt
index 36c9914ec..04ae6fd14 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,6 +37,7 @@ else()
         set(NSDG_NetCDF_Library "netcdf-cxx4")
     else()
         set(NSDG_NetCDF_Library "netcdf_c++4")
+        set(NSDG_NetCDF_Library "netcdf-cxx4")
     endif()
 endif()
 target_include_directories(nextsimlib PUBLIC "${netCDF_INCLUDE_DIR}")
diff --git a/core/test/HaloExchange_test.cpp b/core/test/HaloExchange_test.cpp
index 3d2aa915d..2df7ffe58 100644
--- a/core/test/HaloExchange_test.cpp
+++ b/core/test/HaloExchange_test.cpp
@@ -18,9 +18,9 @@
 using Slice = ArraySlicer::Slice;
 using SliceIter = ArraySlicer::SliceIter;
 
-const auto nx = 9;
-const auto ny = 5;
-const auto nz = 3;
+const auto nx = 6;
+const auto ny = 3;
+const auto nz = 2;
 
 namespace Nextsim {
 
@@ -55,7 +55,7 @@ MPI_TEST_CASE("test halo exchange", 3)
     // Create the ParametricMesh object
     auto CoordinateSystem = Nextsim::CARTESIAN;
     ParametricMesh smesh(CoordinateSystem);
-    smesh.nx = nx + 2;
+    smesh.nx = localNx + 2;
     smesh.ny = ny + 2;
     smesh.nnodes = smesh.nx * smesh.ny;
     smesh.nelements = smesh.nnodes;
@@ -66,13 +66,32 @@ MPI_TEST_CASE("test halo exchange", 3)
             smesh.vertices(i * ny + j, 1) = j;
         }
     }
-    // DGModelArray::ma2dg<DG>(testfield, dgvec);
 
     DGVector<DG> dgvec(smesh);
 
-    ModelArraySlice source(testfield, { { {}, {} } });
+    SliceIter::MultiDim eigDim = { smesh.nx, smesh.ny };
+    Slice centreBlock { { { 1, -1 }, { 1, -1 } } };
+    SliceIter eigCentre(centreBlock, eigDim);
+    Slice wholeArray { { {}, {} } };
 
-    source.copyToDataSlice(dgvec, { { { 1, localNx + 1 }, { 1, ny + 1 } } });
+    // all spatial dims are collapsed into the first dimension (0). The other dimensions are for
+    // higher-order DG components
+    auto eig0 = dgvec.array().col(0);
+
+    testfield[wholeArray].copyToSlicedBuffer(eig0, eigCentre);
+    // testfield[{{{}, {}}}].copyToSlicedBuffer(eig0, { { { 1, localNx + 1 }, { 1, ny + 1 } } });
+
+    for (size_t j = 0; j < ny; ++j) {
+        for (size_t i = 0; i < localNx; ++i) {
+            printf("testfield[%zu, %zu, 0] = %f\n", i, j, testfield(i, j));
+        }
+    }
+    for (size_t j = 0; j < smesh.ny; ++j) {
+        for (size_t i = 0; i < smesh.nx; ++i) {
+            size_t targetPoint = ModelArray::indexFromLocation(ModelArray::Type::DG, { i, j });
+            printf("dgvec[%zu, %zu, 0] = %f\n", i, j, dgvec(targetPoint, 0));
+        }
+    }
 
     int ierr;
     enum Edge { BOTTOM, RIGHT, TOP, LEFT, N_EDGE };
@@ -97,17 +116,6 @@ MPI_TEST_CASE("test halo exchange", 3)
 
     slice.copyToBuffer(vectorBuffer);
 
-    // ModelArray source(ModelArray::Type::H);
-    // source.resize();
-    // // Fill with data
-    // for (size_t i = 0; i < nx; ++i) {
-    //     for (size_t j = 0; j < ny; j++) {
-    //         source(i, j) = j + mx * (i);
-    //     }
-    // }
-
-    // CHECK(source(14, 12) == 12 + mx * (14));
-
     // ierr = MPI_Scatterv()
 
     if (test_rank == 0) {
@@ -119,5 +127,4 @@ MPI_TEST_CASE("test halo exchange", 3)
         exit(1);
     }
 }
-
 }
diff --git a/run/config_benchmark.cfg b/run/config_benchmark.cfg
index 8881e516e..9e414fc39 100644
--- a/run/config_benchmark.cfg
+++ b/run/config_benchmark.cfg
@@ -1,7 +1,7 @@
 [model]
 init_file = init_benchmark_32x32.nc
 start = 2023-01-01T00:00:00Z
-stop = 2023-01-03T00:00:00Z
+stop = 2023-01-02T00:00:00Z
 time_step = P0-0T00:02:00
 
 [Modules]