... Geminga[*]
Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. 
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... stars[*]
USNO-B1.0 stars used for the astrometric transformation of the Geminga field: 1077-0137329, 1078-0139943, 1077-0137377, 1078-0139792, 1078-0139780 and 1077-0137166. 
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... stars[*]
USNO-B1.0 stars used for the transformation of the PSR B0656+14 field: 1042-0123510, 1042-0123514, 1042-0123581, 1042-0123600, 1042-0123481, 1042-0123424 and 1042-0123352. 
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... SUSI[*]
Observational conditions and other details can be found in Bignami et al. (1996). 
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... archive[*]
archive.stsci.edu 
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...2001[*]
See also the HST Data Handbook for NICMOS, stsci.edu/hst/nicmos/documents/handbooks/ 
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... Tutorial[*]
Baggett et al. (2002), in HST WFPC2 Data Handbook, v4, ed. B. Mobasher, Baltimore, STScI. 
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... (v6)[*]
stsci.edu/ftp/instrument news/FOC/Foc handbook 
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... (ETC)[*]
eso.org/observing/etc/ 
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... collected[*]
As in case of Geminga (Sect. 3.1), using archival data we have examined the published fluxes of PSR B0656+14 obtained with different HST instruments. No significant discrepancies from the results as they are listed in K2001 were found. 
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... values[*]
The overestimation of $N_{\rm H}$ in both cases is likely due to the poorly calibrated instrument responses in the energy range of $\la $0.3 keV (e.g., Kargaltsev et al. 2005) which is most crucial for $N_{\rm H}$estimates. This also leads to lower temperatures of thermal emission components and to higher spectral indices of nonthermal components derived from spectral fits. 
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... EGRET)[*]
cossc.gsfc.nasa.gov/docs/cgro/gamcat/ 
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Copyright ESO 2006