change 'Ross' to 'Andy' in legend.

Ross is no longer at Ritherdon and Andy (and Herry) is taking over his
job as a welder.

light-wave.py

@@ -17,7 +17,7 @@ ax = fig.add_subplot(1, 1, 1)
 ys1 = [0] * x_length
 ys2 = [0] * x_length
 ax.set_ylim(y_range)
-line1, = ax.plot(ys1, label='factory1 (Ross)')
+line1, = ax.plot(ys1, label='factory1 (Andy)')
 line2, = ax.plot(ys2, label='factory2 (Tony)')
 plt.title("Personal Flash in Real-Time -- Light Meter Readings in Ritherdon")
 plt.xlabel("<---    Oldest (Time) Latest    --->")