diff --git a/modules/web/fm95.html b/modules/web/fm95.html
index d242dd3..620b846 100644
--- a/modules/web/fm95.html
+++ b/modules/web/fm95.html
@@ -259,36 +259,21 @@
 
                 // draw series
                 function drawLine(hist, color) {
-                    const slice = hist.slice(-nPts).filter((v, i, a) => {
-                        // fill nulls with neighbors for smoother rendering
-                        return true;
-                    });
-                    const pts = slice.map((v, i) => ({ x: i * (W / (nPts - 1)), y: v === null ? null : toY(v) }));
-
+                    const slice = hist.slice(-nPts);
+                    const step  = W / (nPts - 1);
                     ctx.strokeStyle = color;
                     ctx.lineWidth = 1.5;
                     ctx.beginPath();
                     let started = false;
-
-                    for (let i = 0; i < pts.length; i++) {
-                        if (pts[i].y === null) { started = false; continue; }
-                        if (!started) { ctx.moveTo(pts[i].x, pts[i].y); started = true; continue; }
-
-                        // cardinal spline control points
-                        const p0 = pts[i - 2]?.y !== null ? pts[i - 2] : pts[i - 1];
-                        const p1 = pts[i - 1];
-                        const p2 = pts[i];
-                        const p3 = pts[i + 1] ?? p2;
-
-                        const tension = 0.4;
-                        const cp1x = p1.x + (p2.x - p0.x) * tension / 2;
-                        const cp1y = p1.y + (p2.y - p0.y) * tension / 2;
-                        const cp2x = p2.x - (p3.x - p1.x) * tension / 2;
-                        const cp2y = p2.y - (p3.y - p1.y) * tension / 2;
-
-                        ctx.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, p2.x, p2.y);
+                    for (let i = 0; i < slice.length; i++) {
+                    if (slice[i] === null) { started = false; continue; }
+                    const x = i * step;
+                    const y = toY(slice[i]);
+                    if (!started) { ctx.moveTo(x, y); started = true; }
+                    else ctx.lineTo(x, y);
                     }
                     ctx.stroke();
+                    // glow
                     ctx.strokeStyle = color + '44';
                     ctx.lineWidth = 4;
                     ctx.stroke();