What Do the Purple Dots and Signs Represent in the LIGO Experiment Screensaver?

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The purple dots in the LIGO experiment screensaver represent the locations of detected pulsars, which are believed to emit gravitational waves. These pulsars are primarily clustered along the plane of the Milky Way galaxy, particularly near its center. The white dots in the image indicate the constellations. The significance of the purple dots lies in their potential as sources of gravitational waves for scientific study. Understanding these elements enhances the appreciation of the screensaver's representation of astronomical phenomena.
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Can anyone explain what the purples and signs are in this picture?
 

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Well judging from what I can see (I don't know what that is actually showing), I see the constellations in white, the purple may be stars either not relevant to the diagram or (based on the condensed strip shape) it might have something to do with the Milky Way.

The only thing for certain that I know about this is that the white dots are definitely the constellations. Sorry I couldn't be much help on this one.
 
From http://www.einsteinathome.org/about/screensaver.html :

"Pulsars and Supernovae Remnants

Pulsars and Supernovae are shown on the sky because scientists believe they emit gravitational waves. The purple dots on the celestial sphere mark the locations of pulsars* that have already been detected. These are clustered in the plane of our galaxy, the Milky Way, and are mostly near the center of the galaxy. They are likely sources of gravitational waves."
 
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