It would be nice if legends accompanied the various sea ice graphics that get posted on FR. It’s hard to make heads or tails if the colors are not explained.
Sorry if you can not see the legend; it is at the upper left of the graphic:
For Firefox, click "View Image" then "+" and scroll to the upper left where the color code is explained.
For IE-6, I don't see any easy way to enlarge the picture (the "show picture" tab is grayed out) though you might try saving the picture and viewing on Windows Picture Viewer.
Or you might go to the UI-UC website and see if you can work with their images.