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Table 2

Analysis results of the optical R-band light curves.

Name Nr of obs Avg flux densitya Mod indb ρ c ρboot d p e
1ES 0033+595 237 1.18 −0.041 − 0.054 0.26
RGB 0136+391 225 2.21 −0.481 −0.475 < 10-8
3C 66A 362 8.64 −0.294 −0.297 10-8
1ES 0229+200 126 0.16 0.00∗ 0.284 0.282 6.0 × 10-4
HB89 0317+185 91 0.26 −0.794 −0.781 < 10-8
1ES 0414+009 120 1.10 0.135 0.133 0.0707
1ES 0502+675 191 0.95 −0.367 −0.346 8.0 × 10-8
VER J0521+211 59 8.44 0.744 0.741 < 10-8
VER J0648+152 44 0.73 0.838 0.829 < 10-8
1ES 0647+250 218 1.60 0.594 0.597 < 10-8
S5 0716+716 355 17.44 −0.283 −0.278 3.0 × 10-8
1ES 0806+524 245 2.67 0.186 0.187 1.7 × 10-3
RGB 0847+115 41 0.26 −0.557 −0.546 7.0 × 10-5
1ES 1011+496 239 2.19 −0.720 −0.724 < 10-8
Mkn 421 449 25.13 0.576 0.576 < 10-8
Mkn 180 295 1.90 0.871 0.868 < 10-8
RGB 1136+676 102 0.25 −0.162 −0.168 0.053
ON 325 206 3.45 −0.109 −0.096 0.059
1ES 1218+304 151 1.12 −0.132 −0.118 0.0526
ON 231 214 3.80 −0.793 −0.788 < 10-8
PG 1424+240 177 9.34 0.362 0.353 3.6 × 10-8
1ES 1426+428 165 0.48 −0.182 −0.177 9.7 × 10-3
PG 1553+113 344 12.36 −0.014 −0.002 0.401
Mkn 501 447 4.51 0.091 ± 0.004 −0.393 −0.395 < 10-8
H 1722+119 327 3.82 0.721 0.724 < 10-8
1ES 1727+502 289 1.09 0.607 0.605 < 10-8
1ES 1741+196 212 1.05 0.039 ± 0.007 −0.181 −0.176 0.0042
1ES 1959+650 516 5.86 0.319 0.324 < 10-8
MAGIC J2001+439 144 2.63 −0.750 −0.739 < 10-8
BL Lac 404 13.13 0.537 0.537 < 10-8
B3 2247+381 232 0.80 −0.374 −0.373 < 10-8
1ES 2344+514 271 0.81 0.379 0.380 < 10-8

Notes.

(a)

Average flux density in mJy.

(b)

Modulation index.

(c)

Spearman ρ for the 2D linear regression.

(d)

Spearman ρ with bootstrapping for the 2D linear regression.

(e)

p-value for the null hypothesis of no correlation, 5σ limit is 3 × 10-7.

(∗)

The source was too faint for estimating the modulation index.

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