A triplet is a set of three equally spaced spikes. The SETI@home screensaver tests for triplets by looking at every pair of spikes above a certain threshold power. It then looks for another spike precisely between the two spikes. If one is found, a triplet is logged and sent back to Berkeley.
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SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.