I'm using the flat pano with the following view attribute:

<view hlookat="0.0"
vlookat="0.0"
fovtype="MFOV"
fov="120"
maxpixelzoom="1.0"
fovmin="70"
fovmax="140"
limitview="fullrange" />
this is in a context where hotspots on a map point towards equirectangular images and then back to the flat pano map.
The limitview="fullrange" is giving me the best result as the flat pano loads every time with full view of the map image.
But the only thing that I'm trying to get is to align the map image's upper edge to the top edge of the browser (when the image loads on a mobile screen, it is actually vertically centred in the viewport, so there's a black space on top and bottom. How to get the flat image to load with its upper edge aligned to the top of the browser?