PA of $76 \pm 8^\circ$. These results are therefore almost exactly the same as the empirical method used above and therefore lead to the same conclusion of misalignment.

As will become apparent in §\[s:spatial\], there is reason to believe that the disk plane could be perpendicular to the binary pericenter direction. The projection of the binary pericenter direction on the sky plane has a PA of $163 \pm 2^\circ$, and a line perpendicular to this has a PA of $73 \pm 2^\circ$. Therefore, the observed disk position angle of about 72$^\circ$ is consistent with being at 90$^\circ$ to the binary pericenter direction.

SED {#s:sed}
===

![SED for the 99 Her system (both stars) showing the stellar and disk models (grey lines) and star+disk model (black line). The blackbody disk model is the solid grey line, and the physical grain model the dashed line. Photometric measurements are shown as black filled circles, and synthetic photometry of the stellar atmosphere as open circles ($U-B$, $B-V$, & $b-y$ colours, and $m1$ and $c1$ Stromgren indices were fitted but are not shown here). Black triangles mark upper limits from IRAS at 60 and 100$\mu$m.[]{data-label="fig:sed"}](F037AB.eps){width="50.00000%"}

The combination of all photometry for 99 Her allows modelling 