I don't know if anyone thinks it's important or not but,

http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1698.pdf

Contains a rather serious graph labeling error;

Their Longitude scale goes from 0 to 360, in the wrong direction.

Their actual Map is the one with 0,0 in the center of the map and then moving out to 180 degrees on the edges, not the middle.

I'm assuming that Mr. Rifkin and Mr. Mustard plotted the data correctly and the map label is a big typo.

On another note, regarding graphing the flow/stain features , Efrain has graphed a map of Mars with Longitude 0 on the right hand side of the map moving to 360 on the left, with 180 in the center of the Map. This map layout has the advantage of not splitting one of the flow distribution centers on two edges of the map and lets the bi-modality of the discovery be more clearly displayed.

If you have not seen Efrain's paper yet it can be found at;

http://www.eskimo.com/~jill/seeps_paper.pdf