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Looking north to the western end of the Santa Catalina Mountains in Tucson, Arizona this afternoon, from a parking lot just off a major E/W thoroughfare. The small thin clouds caused a 'bright shadow' where I was, while the mountains were in full sun. Cholla cactus on the right; the holes in the sahuaro are from Gila woodpeckers (pic of one in my gallery); very small light-green vertical marks on base of mountains are more sahuaro cacti.