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Fig. 2

image

Histogram of the intrinsic modulation indices for the optical (top) and radio (bottom) light curves. The uncertainty of the intrinsic modulation indices (typically 0.01, largest value 0.044) are smaller than the bin size. According to a K-S test, the probability that optical and radio modulation index distributions come from the same parent population is very low (p = 1.3 × 10-5).

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