- Lab 4:
  - This lab will introduce you to using the `PLOT` command.
  - What you need to do:
    1. Use `PLOT` to plot the file `apenny.prm`.
    2. Use `PLOT` to plot the file
       original: `http://nextmidas.com/nm/nxm/sys/dat/apenny.prm` (currently unavailable)
       alternate: `file:///opt/midas/nxmlatest/nxm/sys/dat/apenny.prm` (where /opt/midas/nxmlatest is a softlink to your local nxm installation)
    3. Use `PLOT` to plot the `world.shp` and `cities.prm` files at the same time.
    4. With the plot still up from the previous exercise, use the middle mouse button to disable the `cities` layer. Now enable the layer. Can you figure out how to turn off the on-axis readout?
    5. Use the "Plotting Maps from a NeXtMidas Map Server (NMS)" section in the `PLOT` explain file to bring up a map of the world with the BLUEMARBLE background. Use the server `nextmidas.com` (currently unavailable) and the port `8080` (You need Internet access for this).
       Hint: To get a full list of available VIEWs look in the NeXtMidas API at the "MPlot" class , and look at documentation for the `viewList` field.
    6. `PLOT apenny` in the background. Then use the `FEATURE` command to place a box around Lincoln's nose.