Top: coadded Chandra images of HE 0227–0931 and HE 0351+0240 (with readout streaks) and the corresponding simulated PSFs. The color scale is in units of counts per second, shown by the right-hand colorbar. Bottom: spectra of the co-added, background subtracted point sources taken from the readout streaks (shown in the thick black regions above, with adjacent background regions), binned to have a minimum significance of 5 per bin. The spectra were fit to a single power-law, with the xspec model: (phabs*powlaw1d). In each model we fixed Galactic absorption to the value reported in XSPEC, 3.26  ×  10²⁰ cm⁻² for HE 0227–0913 and 1.28  ×  10²¹ cm⁻² for HE 0351+0240. The best-fit models (solid black lines) were used to simulate the PSFs (shown above).