Next is a space between the first and second set of coordinates. These next numbers are the coordinates of the bottom right corner of the rectangle. The browser can accommodate other shapes of clickable area. Here are some other formats. They're only included to separate the items.
Coordinates are the x,y position of the cursor on an image map in pixels.
The starting point is the top left corner of the image. Getting the coordinates is one of the trickiest things with image maps. Well, I found a way to read off the coordinates and then put them into the map. The browser then treats the image differently in the browser. It waits for a click on the image and records the coordinates for comparison with the .map file.