diff --git a/Tools/genplot2.c b/Tools/genplot2.c
index de1c9a3..f052b7c 100644
--- a/Tools/genplot2.c
+++ b/Tools/genplot2.c
@@ -11,8 +11,8 @@
 
 #define XMIN 0
 #define YMIN 0
-#define XMAX 640		/* constant from a 'dddd' */
-#define YMAX 480		/* constant from a 'dddd' */
+#define XMAX 800		/* constant from a 'dddd' */
+#define YMAX 600		/* constant from a 'dddd' */
 
 /*::------------------------------------------------------------------::*/
 static 	Image_Desc	*image;
@@ -120,8 +120,8 @@ if ((fp = fopen(filename, "r"))==NULL) {
 	}
 
 nbp = 0;
-xmin =  9999999;		xmax = -9999999;
-ymin =  9999999;		ymax = -9999999;
+xmin =  9999999.99;		xmax = -9999999.99;
+ymin =  9999999.99;		ymax = -9999999.99;
 while ( fscanf(fp, "%lf %lf %d", &x, &y, &v) == 3 ) {
 	nbp++;