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Table 3:

P and $\dot{f}$ derived from different methods in this paper, compared to previous results.

Solution
Period-8.391115 $\dot{f}$ rms d.o.f. $\chi ^{2}$/d.o.f.
  $\times$10-7 [s] $\times$10-16 [Hz/s] [s]    
This work, hard band
``all data'' 3.336(22) -9.961(67) 0.62 70-3 45
After fitting a sine 0.29 70-5 7.8
After fitting an abs(sine) 0.31 70-5 8.6
without ROSAT 3.362(39) -9.946(74) 0.60 64-3 47
After fitting a sine 0.19 64-5 5.3
After fitting an abs(sine) 0.21 64-5 6.5
without Chandra 3.310(22) -9.940(71) 0.61 58-3 47
After fitting a sine 0.31 58-5 9.7
After fitting an abs(sine) 0.33 58-5 8.7
Z12 ``all data'' 3.09(14) -9.992(61) 0.73 70-3 64
Z12 without ROSAT 2.96(13) -10.047(34) 0.58 64-3 46
Z12 without Chandra 3.09(13) -9.980(36) 0.72 58-3 51
This work, soft band
``all data'' 3.429(22) -9.956(72) 0.50 70-3 40
Z12 ``all data'' 3.31(62) -9.959(17) 0.50 70-3 39

Previous work (applied to the hard band)
vK07 (``all data'') 2.670(84) -9.88(13) 0.97 70-3 81
vK07 (without ROSAT) 2.846(77) -9.74(04) 1.30 64-3 207
KvK05 (``all data'') 3.20(13) -9.918(15) 0.64 70-3 56
KvK05 (Chandra) 3.05(16) -9.97(06) 0.64 12-3 57

Notes. For the timing solution in this work we always excluded the Chandra HRC observation 7251. Since the phase residuals seem to follow a periodic pattern we fitted a sine and an abs(sine), see Sect. 6. All errors correspond to 1$\sigma $ confidence (for the Z12 solution see Ransom et al. 2002 with errors scaled to $\sqrt {\chi ^{2}/{\rm d.o.f.}}$, for the phase coherent solutions, see Sect. 5).


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