-DEFGEOM(single, 0, 0, sw, 0, bh, sw, sh-bh, wx, wy, 0.55*sw, wh, mx+mw, wy, ww-mw, wh, wx, wy, ww, wh)
-DEFGEOM(dual, 0, 0,1280, 0, bh, ww, wh-bh, wx, wy, 1280,800-bh, 1280, 0, ww-mw, sh, mx, my, mw, mh)
-/* DEFGEOM(growmaster, bx, by, bw, wx, wy, ww, wh, mx, my, mw+20, mh, mx+mw, ty, tw-20, th, mox, moy, mow, moh) */
-/* DEFGEOM(shrinkmaster, bx, by, bw, wx, wy, ww, wh, mx, my, mw-20, mh, mx+mw, ty, tw+20, th, mox, moy, mow, moh) */
+#define MFACT 0.55 /* master width factor [0.1 .. 0.9] */
+DEFGEOM(single, 0, 0, sw, 0, bh, sw, sh-bh, wx, wy, mfact*sw, wh, mx+mw, wy, ww-mw, wh, wx, wy, ww, wh)