diff --git a/bedstead.c b/bedstead.c
index c0f1dad..ba7c22a 100644
--- a/bedstead.c
+++ b/bedstead.c
@@ -108,8 +108,13 @@
 
 #define VERSION "002.009"
 
+/* Metrics expressed in pixels. */
 #define XSIZE 6
 #define YSIZE 10
+#define ASCENT 8
+#define DESCENT 2
+#define XHEIGHT 5
+#define CAPHEIGHT ASCENT
 
 /*
  * Design parameters.  These can vary between fonts in the Bedstead family.
@@ -2860,9 +2865,9 @@ main(int argc, char **argv)
 	printf("  <created value='%s'/>\n", timestr);
 	printf("  <modified value='%s'/>\n", timestr);
 	printf("  <xMin value='%d'/>\n", 0);
-	printf("  <yMin value='%d'/>\n", (int)(-2 * YPIX));
+	printf("  <yMin value='%d'/>\n", (int)(-DESCENT * YPIX));
 	printf("  <xMax value='%d'/>\n", (int)(XSIZE * XPIX));
-	printf("  <yMax value='%d'/>\n", (int)((YSIZE - 2) * YPIX));
+	printf("  <yMax value='%d'/>\n", (int)(ASCENT * YPIX));
 	printf("  <macStyle value='00000000 0%c%c000%c'/>\n",
 	       width->ttfwidth > 5 ? '1' : '0', /* Expanded? */
 	       width->ttfwidth < 5 ? '1' : '0', /* Condensed? */
@@ -2875,8 +2880,8 @@ main(int argc, char **argv)
 
 	printf(" <hhea>\n");
 	printf("  <tableVersion value='0x00010000'/>\n");
-	printf("  <ascent value='%d'/>\n", (int)((YSIZE - 2) * YPIX));
-	printf("  <descent value='%d'/>\n", (int)(-2 * YPIX));
+	printf("  <ascent value='%d'/>\n", (int)(ASCENT * YPIX));
+	printf("  <descent value='%d'/>\n", (int)(-DESCENT * YPIX));
 	printf("  <lineGap value='0'/>\n");
 	printf("  <advanceWidthMax value='%d'/>\n", (int)(XSIZE * XPIX));
 	printf("  <minLeftSideBearing value='0'/>\n");
@@ -3931,7 +3936,7 @@ bdf_gen(int px_height)
 	int px_width = (px_height * XPIX * XSIZE) / (YPIX * YSIZE);
 	int pt_height = (long)(px_height * 7227 + 3750) / 7500;
 	int dpt_height = (long)(px_height * 7227 + 375) / 750;
-	int base = (px_height * 200) / (YPIX * YSIZE);
+	int base = DESCENT;
 	int i;
 
 	printf("%%!\n");