(A) HD 15175 ACS discovery image (from Kalas et al. 2007a; see Figure 1). The central masked region r = 1'' but "the presence of quasi-static speckles produces significant PSF-subtraction residuals, limiting the detection radius to ~2 arcseconds," (p. 161). (B) STIS three-roll combined image (visits B5–B8 only) improves over ACS IWA_effective = 2'' undegraded from residuals by ~×7 to IWA_effective = 03 (19 AU projected; central yellow circle). The dotted black circle corresponds to the r = 1'' digital mask imposed on ACS image in panel (A). The solid gray circle corresponds to the larger r = 2'' effective IWA in the ACS. Log₁₀ display [−2.2] to [+2.5] {dex} cps pixel⁻¹. (C) Same STIS data as panel (B), but with the disk major axis rotated to image horizontal and log₁₀ monochrome display [−1.5] to [+1.5] {dex} cps pixel⁻¹. Field shown: 350 × 350 STIS pixels (1775 × 1775). N.B.: point object (revealed as binary with STIS) is non-common proper motion background star superimposed on the disk, as determined with NICMOS (2004)/STIS (2012) two-epoch data.