message: Plotting Java
diff: @@ -48,7 +48,7 @@ public class Takeoff {
  double t = telem[0];
  z = -telem[9];
  - System.out.printf("u=%3.3f z=%3.3f dzdt=%e\n", u, z, dzdt);
  + System.out.printf("%3.3f,%+3.3f\n", t, z);
  // Compute vertical climb rate as first difference of altitude over time
  if (t > tprev) {
  