diff --git a/test/output/grid2.svg b/test/output/grid2.svg
new file mode 100644
index 0000000..470fdf5
--- /dev/null
+++ b/test/output/grid2.svg
@@ -0,0 +1,29 @@
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+    <path d="M500,390.625L500,359.375L500,328.125L500,296.875L500,265.625L500,234.375L500,203.125L500,171.875L500,140.625L500,109.375L500,78.125L500,46.875L500,15.625L500,0L484.375,0L453.125,0L421.875,0L390.625,0L359.375,0L328.125,0L296.875,0L265.625,0L234.375,0L203.125,0L171.875,0L140.625,0L134.674,0L134.674,15.625L140.625,18.711L171.875,35.891L190.324,46.875L203.125,54.902L234.375,76.052L237.26,78.125L265.625,99.723L277.381,109.375L296.875,126.395L312.07,140.625L328.125,156.677L342.362,171.875L359.375,191.355L369.041,203.125L390.625,231.463L392.718,234.375L413.873,265.625L421.875,278.381L432.889,296.875L450.073,328.125L453.125,334.008L465.679,359.375L479.915,390.625L484.375,401.015L500,401.18Z" fill="rgb(255, 164, 35)"></path>
+    <path d="M500,296.875L500,265.625L500,234.375L500,203.125L500,171.875L500,140.625L500,109.375L500,78.125L500,46.875L500,15.625L500,0L484.375,0L453.125,0L421.875,0L390.625,0L359.375,0L328.125,0L296.875,0L265.625,0L234.375,0L204.584,0L204.584,15.625L234.375,33.681L254.296,46.875L265.625,54.826L296.223,78.125L296.875,78.653L328.125,105.702L332.065,109.375L359.375,136.682L363.052,140.625L390.112,171.875L390.625,172.509L413.944,203.125L421.875,214.422L435.095,234.375L453.125,264.114L453.993,265.625L470.979,296.875L484.375,323.97L500,323.97Z" fill="rgb(255, 137, 30)"></path>
+    <path d="M500,234.375L500,203.125L500,171.875L500,140.625L500,109.375L500,78.125L500,46.875L500,15.625L500,0L484.375,0L453.125,0L421.875,0L390.625,0L359.375,0L328.125,0L296.875,0L274.495,0L274.495,15.625L296.875,30.909L318.269,46.875L328.125,54.729L355.188,78.125L359.375,82.007L386.748,109.375L390.625,113.555L414.034,140.625L421.875,150.462L437.862,171.875L453.125,194.218L458.847,203.125L477.472,234.375L484.375,246.926L500,246.926Z" fill="rgb(253, 109, 26)"></path>
+    <path d="M500,140.625L500,109.375L500,78.125L500,46.875L500,15.625L500,0L484.375,0L453.125,0L421.875,0L390.625,0L359.375,0L344.405,0L344.405,15.625L359.375,27.332L382.24,46.875L390.625,54.602L414.152,78.125L421.875,86.502L441.431,109.375L453.125,124.322L465.016,140.625L484.375,169.881L500,169.881Z" fill="rgb(236, 81, 21)"></path>
+    <path d="M500,78.125L500,46.875L500,15.625L500,0L484.375,0L453.125,0L421.875,0L414.314,0L414.314,15.625L421.875,22.542L446.213,46.875L453.125,54.427L473.117,78.125L484.375,92.835L500,92.573Z" fill="rgb(213, 55, 15)"></path>
+    <path d="M500,15.625L484.375,0L484.225,15.625L484.375,15.791Z" fill="rgb(186, 34, 8)"></path>
+    <path fill="rgb(162, 18, 2)"></path>
+    <path fill="rgb(146, 12, 0)"></path>
+  </g>
+</svg>
\ No newline at end of file
diff --git a/test/snapshots/index.js b/test/snapshots/index.js
index 6ded72c..3a225fb 100644
--- a/test/snapshots/index.js
+++ b/test/snapshots/index.js
@@ -87,7 +87,7 @@ function svgContours(data, {width = 500, smooth = true} = {}) {
   const m = data.height;
   const height = Math.round(m / n * width);
   const path = geoPath().projection(geoIdentity().scale(width / n));
-  const color = scaleSequential(interpolateTurbo).domain(extent(data.values, d => isFinite(d) ? d : NaN)).nice();
+  const color = scaleSequential(interpolateTurbo).domain(extent(data.values, (d) => isFinite(d) ? d : NaN)).nice();
   const svg = create("svg")
       .attr("width", width)
       .attr("height", height)
@@ -98,7 +98,7 @@ function svgContours(data, {width = 500, smooth = true} = {}) {
     .selectAll()
     .data(color.ticks(20))
     .join("path")
-      .attr("d", d => path(contours().smooth(smooth).size([n, m]).contour(data.values, d)))
+      .attr("d", (d) => path(contours().smooth(smooth).size([n, m]).contour(data.values, d)))
       .attr("fill", color);
   return svg.node();
 }
@@ -150,3 +150,94 @@ export function matrixContours4Holes() {
   data.values[18700] = +Infinity;
   return svgContours(data);
 }
+
+export function grid2() {
+  return svgContours({
+    values: [
+      [
+        3.931884, 3.949764, 3.967644, 3.985524, 4.003405, 4.021285,
+        4.039165, 4.057045, 4.074925, 4.092805, 4.110685, 4.128565,
+        4.146446, 4.164326, 4.182206, 4.200086
+      ],
+      [
+        3.890766, 3.910306, 3.929845, 3.949385, 3.968925, 3.988464,
+        4.008004, 4.027544, 4.047084, 4.066623, 4.086163, 4.105703,
+        4.125243, 4.144782, 4.164322, 4.183862
+      ],
+      [
+        3.849648, 3.870847, 3.892046, 3.913245, 3.934445, 3.955644,
+        3.976844, 3.998043, 4.019242, 4.040442, 4.061641, 4.08284, 4.10404,
+        4.125239, 4.146438, 4.167637
+      ],
+      [
+        3.808529, 3.831388, 3.854247, 3.877106, 3.899965, 3.922824,
+        3.945683, 3.968542, 3.991401, 4.014259, 4.037118, 4.059978,
+        4.082836, 4.105695, 4.128554, 4.151413
+      ],
+      [
+        3.767411, 3.791929, 3.816448, 3.840966, 3.865485, 3.890004,
+        3.914522, 3.939041, 3.963559, 3.988078, 4.012596, 4.037115,
+        4.061633, 4.086152, 4.11067, 4.135189
+      ],
+      [
+        3.726293, 3.752471, 3.778649, 3.804827, 3.831005, 3.857183,
+        3.883361, 3.909539, 3.935718, 3.961896, 3.988074, 4.014252, 4.04043,
+        4.066608, 4.092786, 4.118965
+      ],
+      [
+        3.685174, 3.713012, 3.74085, 3.768687, 3.796525, 3.824363, 3.852201,
+        3.880038, 3.907876, 3.935714, 3.963552, 3.991389, 4.019227,
+        4.047065, 4.074903, 4.10274
+      ],
+      [
+        3.644056, 3.673553, 3.703051, 3.732548, 3.762045, 3.791543, 3.82104,
+        3.850537, 3.880035, 3.909532, 3.939029, 3.968527, 3.998024,
+        4.027521, 4.057019, 4.086516
+      ],
+      [
+        3.602938, 3.634095, 3.665252, 3.696409, 3.727566, 3.758723,
+        3.789879, 3.821036, 3.852193, 3.88335, 3.914507, 3.945664, 3.976821,
+        4.007978, 4.039135, 4.070292
+      ],
+      [
+        3.56182, 3.594636, 3.627453, 3.660269, 3.693086, 3.725902, 3.758719,
+        3.791535, 3.824352, 3.857168, 3.889985, 3.922801, 3.955618,
+        3.988434, 4.021251, 4.054067
+      ],
+      [
+        3.520701, 3.555177, 3.589653, 3.62413, 3.658606, 3.693082, 3.727558,
+        3.762034, 3.79651, 3.830986, 3.865462, 3.899939, 3.934415, 3.968891,
+        4.003367, 4.037843
+      ],
+      [
+        3.479583, 3.515719, 3.551854, 3.58799, 3.624126, 3.660262, 3.696397,
+        3.732533, 3.768669, 3.804804, 3.84094, 3.877076, 3.913212, 3.949347,
+        3.985483, 4.021619
+      ],
+      [
+        3.438465, 3.47626, 3.514055, 3.551851, 3.589646, 3.627441, 3.665237,
+        3.703032, 3.740827, 3.778623, 3.816418, 3.854213, 3.892009,
+        3.929804, 3.967599, 4.005394
+      ],
+      [
+        3.397346, 3.436801, 3.476256, 3.515711, 3.555166, 3.594621,
+        3.634076, 3.673531, 3.712986, 3.752441, 3.791896, 3.83135, 3.870805,
+        3.91026, 3.949715, 3.98917
+      ],
+      [
+        3.356228, 3.397343, 3.438457, 3.479572, 3.520686, 3.561801,
+        3.602915, 3.64403, 3.685144, 3.726259, 3.767373, 3.808488, 3.849602,
+        3.890717, 3.931831, 3.972946
+      ],
+      [
+        3.31511, 3.357884, 3.400658, 3.443432, 3.486206, 3.52898, 3.571754,
+        3.614529, 3.657303, 3.700077, 3.742851, 3.785625, 3.828399,
+        3.871173, 3.913947, 3.956722
+      ]
+    ]
+      .flat()
+      .map((d) => 5 * d),
+    width: 16,
+    height: 16
+  });
+}
\ No newline at end of file