Table 1: The best model fits to the MOS spectra of the source 52, and the MOS and PN spectra of PSR J0751+1807 and PSR J1012+5307. For PSR J0751+1807 the interstellar absorption ($N_{\rm H}$) was fixed at $4 \times 10{\rm ^{20}}$ cm-2. For PSR J1012+5307 the $N_{\rm H}$ was fixed at $7 \times 10{\rm ^{19}}$ cm-2. For source 52, z was fixed at 0.255. All the errors shown are 1$\sigma $ confidence limits. The fluxes and luminosities are given for the 0.2-10.0 keV band.
Object Spectral $N_{\rm H}$ (cm-2) kT Photon Abundance $\chi^{ 2}_{ \nu}$ d.o.f. Flux ( $\times 10^{-13}$) Luminosity
  model ($\times$10 ${\rm ^{22}}$) (keV) Index       ( ${\rm ergs~ cm}^{-2}~{\rm s}^{-1}$) ( ${\rm ergs~s}^{-1}$)
PSR J0751+1807 Power law 0.04 - $1.59\pm0.20$ - 1.33 14 0.44 $2.1\times 10^{31}$
  Bremsstrahlung 0.04 $12.36\pm12.31$ -   1.52 14    
  Blackbody 0.04 $0.32\pm0.04$ -   2.21 14    
Source 52 Power law $0.13\pm0.06$ - $1.46\pm0.13$ - 0.86 32 2.0 $1.9\times 10^{43}$
  Bremsstrahlung $0.09\pm0.05$ $17.31\pm10.42$ -   0.87 32    
  Raymond Smith $0.07\pm0.04$ $17.63\pm12.78$ - $0.16\pm1.20$ 0.89 31    
PSR J1012+5307 Power law 0.007 - $1.78\pm0.36$ - 1.27 9 1.2 $3.9\times 10^{30}$
  Bremsstrahlung 0.007 $1.95\pm1.45$ -   1.29 9    
  Blackbody 0.007 $0.26\pm0.04$ -   1.37 9    


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