Spatial Resolution

The spatial resolution of SIXA is determined by the point spread function of the SODART telescope ($\sim$2.5$^{\prime}$-3$^{\prime}$HPD on-axis, decreasing with increasing energy). One SIXA pixel corresponds to a single detector element. The active diameter of 9.25 mm corresponds to $\sim 4^{\prime}$ for an f = 8 m telescope. The encircled energy in the central SIXA pixel is $\sim$57%-$\sim$65% (6.6-11 keV) for a point source on-axis. The corresponding encircled energies, accounting for the dead area between pixels, are $\sim$73%-76% for the central 7 pixels, and $\sim$76%-79% for all 19 pixels.