Verification Examples - Results Two-spot pattern movement is bogus Moving U-shaped pattern is real; Runge-Kutta gives little if any benefit Asymptotic trends in values and in measurement errors, as expected model dist pixels time velocity (meas.err) std 0.55418 79.2 35076 1/63294(45) s1.4 0.59863 121.1 37342 1/62379(64) s2 0.57042 163.1 35456 1/62159(27) s2.8 0.56947 230.3 35258 1/61913(44) s4 0.56553 323.5 35009 1/61905(12) cross-qtr.