Hardcode the settled sizes, streams and batch instead of carrying flags for them

probe.go

@@ -54,7 +54,7 @@ func (v cableView) minText() string {
 
 // Averaging the two directions cancels the phy asymmetry between them, which is
 // about 790ns and swamps any cable, so one direction alone cannot give a length.
-func (c config) cableMetres(views []view) (float64, bool) {
+func cableMetres(views []view, nsPerM float64) (float64, bool) {
 	if len(views) == 0 {
 		return 0, false
 	}
@@ -65,7 +65,7 @@ func (c config) cableMetres(views []view) (float64, bool) {
 		}
 		excess += float64(v.cable.min - v.cable.floor)
 	}
-	return excess / float64(len(views)) / c.nsPerM, true
+	return excess / float64(len(views)) / nsPerM, true
 }
 
 func newCableStats() *cableStats {