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3FGL BLLacs and FSRQs radio flow / X-ray flux ratio histogram. A BLL clean area is distinguished by ratio values minor than 4 x 10^13. We used also this parameter to optimize the algorithm
Using the optimized version of the original algorithm the selecting performance improved of 79 %. The final result of this study applying the algorithm to 3FGL BCUs left 16 uncertain blazar sources instead of 77 in https://arxiv.org/abs/1607.07822
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