8. Reading the names of your image files from another file. This example is identical to second part of example #4 except that the image filenames are all taken from a "file_of_filenames", and we force the map to be initially displayed.
Recall that in example #4, the file descriptors looked like:
To force the overlay basemap to be initially "on", we add the "/on" parameter to the end of the overlay_labels tag:
And, let's make the overlays of temperature and streamlines "radio buttons", so that only one of them may be "on" at once:
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