SPIRE350             22             7 PSF fit
  SPIRE500              4             8 PSF fit

  : *Herschel* photometry of 99 Her. The disk is not detected at 500$\mu$m and can be considered a 3$\sigma$ upper limit of 24mJy.[]{data-label="tab:obs"}

We now analyse the PACS images using 2D Gaussian models to estimate the disk size, inclination, and position angle. A 2D Gaussian fits the star-subtracted PACS 100$\mu$m image fairly well, with major and minor full-width half-maxima of 17.7 and 12.8” at a position angle of $78^\circ$. Quadratically deconvolving from the 6.7” FWHM beam assuming a circular ring implies an inclination of $48^\circ$ from face-on and an estimated diameter of 250AU. Gaussian fitting to star-subtracted images at both 70 and 160$\mu$m yields similar results.

As noted above, estimation of uncertainties in these parameters is non-trivial due to correlated noise, but made easier by the constant depth of our survey. By inserting the best fit Gaussian to the star-subtracted image of the 99 Her disk from the 100$\mu$m image into 438 other 100$\mu$m maps at high coverage positions offset from the intended target, we obtain a range of fit parameters for hundreds of different realisations of the same noise. This process yields an inclination of $45 \pm 5^\circ$ and 