Table 5: M1, the estimated pre-1967-outburst accretion rate $\dot{M}_{\rm pre-OB}$ (for $L_{\rm disk}$ = 140 $L_{\odot }$), the theoretical ignition mass  $M_{\rm ign}$, the accreted mass $M_{\rm accr}$ = 22 $\cdot $ $\dot{M}_{\rm pre-OB}$ and the expected recurrence time $\tau $ = $M_{\rm ign}$/ $\dot{M}_{\rm pre-OB}$.
M1 $\dot{M}_{\rm pre-OB}$ $M_{\rm ign}$ $M_{\rm accr}$ $\tau $
($M_{\odot }$) (10-8 $M_{\odot }$ yr-1) (10-7 $M_{\odot }$) (10-7 $M_{\odot }$) (yrs)
1.00 7.32 77.2 16.10 105.5
1.05 6.56 67.6 14.43 103.0
1.10 5.84 56.2 12.84 96.2
1.15 5.12 45.7 11.26 89.2
1.20 4.40 36.3 9.68 82.5
1.25 3.72 25.7 8.18 69.1
1.30 3.02 16.2 6.64 53.6
1.33 2.62 11.0 5.76 42.0
1.35 2.34 7.69 5.15 32.8
1.36 2.22 6.14 4.88 27.7
1.37 2.08 4.73 4.58 22.7
1.38 1.94 3.44 4.27 17.7
1.39 1.80 2.29 3.96 12.7
1.40 1.68 1.33 3.69 7.9

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