However, your image analysis and discussion should not be limited to the questions and summaries provided here, since the imagery reveals many additional interesting phenomena. You are now ready to begin the laboratory exercises. Sets loop bounds from frame 1 to frame 2. Controls the time spent on each image in the loop. Moves loop ahead one frame.
Moves loop back one frame.
Changes current frame and loop bounds between opposite loops. Draws map background over the current loop. Set loop bounds first. Multiple keys which are to be struck simultaneously will be separated by a '-'. For example Alt-L above.