  Observations of PSR B0656+14 using the Chandra Low Energy Transmission
Grating Spectrometer are presented. The zeroth order events are pulsed at an
amplitude of 10 +/- 2% and the image may be slightly extended. The extended
emission is modelled as a Gaussian with a FWHM of about 0.75", for a linear
size (at a distance of 760 pc) of 8.5e15 cm. In the absence of systematic
errors in the detector point spread function, the extended emission comprises
<~ 50% of the observed flux in the 0.2-2.0 keV band, for a luminosity of <~
3e32 erg/s. The spectrum is well modelled by a dominant blackbody with T =
8.0e5 +/- 3e4 K and a size of 22.5 +/- 2.1 km in addition to a harder component
that is modelled as a hotter and much smaller blackbody. No significant
absorption features are found in the spectrum that might be expected from
ionization edges of H or He or bound-bound transitions of Fe in magnetized
atmospheres. Such features are expected to be deep but could vary in position
or strength with rotation phase. There are no strong absorption features in the
pulse-phased spectra, however, so we conclude that the atmosphere is not
dominated by Fe or other heavy elements that would be partially ionized at a
temperature of 1e6 K.
