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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Laboratory investigation of earthquake lightning due to landslide

Fig. 2

Photographs of photoemissions from a granite, b pyroclastic rock, c biotite-bearing rhyolite, and d limestone. Note that the scale in b and d are enlarged with increased brightness to make the photoemission patterns easier to see. The RGB intensities on a scale of 0 to 255 are also noted in ad. All RGB values are based on the original brightness of the photos when they were taken

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