This model has also applicability as upper boundary to Fanno flow.

Flares were used to mark the upper boundary of the track.

Denser vegetation marked the upper boundary of the forest patch.

As with Earth, the top atmospheric layer, the exosphere, does not have a well defined upper boundary.

The wage inequality studies may therefore represent an upper boundary for what the real effect of immigration is on domestic wages.

The upper boundary was set at the start of the Pleistocene glaciations.

The upper boundary of this group is not seen.

It presents the upper boundary for the actually issued share capital.

Also found on the underside of the wings are two indistinct white spots along its upper boundaries.

A river's head of tide may be considered the upper boundary of its estuary.