and (3). These coordinates correspond to either the geometric centroid of the nebula or, in three cases, the newly identified central stars. They agree to within 1 with the (likely more accurate) RP positions, which is consistent with the accuracy of the [*HST*]{} guide star frame of reference [GSC 1.1, @Morrison_etal01]. Nebular diameters along the major and minor axes, given in column (4), were usually measured with respect to the 20% intensity contour of the outermost structure that was visible in the [*HST*]{} image. The dimensions given in Table \[Morph\] are generally smaller than those cited by @RP06b. The reasons for the discrepant sizes are varied: a) Nebulae smaller than 34 were not resolved in the RP data; b) one or more nebulae (probably including RP1550) are surrounded by faint, outer shells or halos that are not detected in these HST exposures; c) differing measurement techniques were employed: here we prefer the 20% intensity contour, in part because of the limited S/N ratio of the [*HST*]{} data and the impracticality of measuring a photometric radius, whereas @RP06b measured the full width at zero intensity in monochromatic light; d) nebulae embedded in a bright continuum were problematic to measure in the 