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Table 2:

Characteristic level and duty cycle of HBLs considered.
Source name $R_{\rm char}$ (ASM c/s) $\sigma _{\rm char}$ (ASM c/s) $D_{1\sigma}$ (%) $S_{1\sigma}$ (%) $D_{3\sigma}$ (%) $S_{3\sigma}$ (%)
Mkn 421 0.5 0.4 40.3 1.0 18.1 0.5
Mkn 501 0.4 0.2 25.8 3.0 9.7 2.3
1ES 1959+650 0.3 0.2 14.2 7.1 2.6 9.5
1ES 2155-304 0.2 0.4 27.0 22.1 4.9 18.8
For each HBLs considered we give the characteristic level $R_{\rm char}$ and its standard deviation $\sigma _{\rm char}$. The duty cycle for active state $D_{1\sigma}$ and for very high states $D_{3\sigma}$ is also reported together with the relative intrinsic fluctuations still present above the $R_{\rm char}+1\sigma$ or $R_{\rm char}+3\sigma$ threshold due to RXTE/ASM ( $S_{1\sigma}$, $S_{3\sigma}$).

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