Megatest

		  (if (not (null? vals))
		      (let* ((maxval   (apply max vals))
			     (minval   (apply min vals))
			     (yoff     (- minval lly)) ;;  minval))
			     (deltaval (- maxval minval))
			     (yscale   (/ delta-y (if (eq? deltaval 0) 1 deltaval)))
			     (yfunc    (lambda (y)(+ lly (* yscale (- y minval)))))) ;; (lambda (y)(* (+ y yoff) yscale))))
			;; (print (car cf) "; maxval: " maxval " minval: " minval " deltaval: " deltaval " yscale: " yscale)
			(vg:add-obj-to-comp
			 cmp 
			 (vg:make-text-obj (- llx 10)(yfunc maxval) (conc maxval)))
			(vg:add-obj-to-comp
			 cmp 
			 (vg:make-text-obj (- llx 10)(yfunc minval) (conc minval)))
			(fold 
			 (lambda (next prev)  ;; #(time ? val) #(time ? val)
			   (if prev
			       (let* ((yval       (vector-ref prev 2))
				      (last-tval  (tfn   (vector-ref prev 0)))
				      (last-yval  (yfunc yval)) ;; (+ lly (* yscale (vector-ref prev 2))))
				      (curr-tval  (tfn   (vector-ref next 0))))