Even with XMM-Newton's sensitivity, the discovery was only possible because the filament is along the line of sight, concentrating the emission from the entire filament in a small region of the sky.

In this dissertation, extensive researches on the electrical and field emission properties of nano-carbon films prepared by hot filament chemical vapor deposition (HFCVD).

The experiment of measuring metal electron work function usually neglects the loss caused by the electron emission of tungsten filament, so the system error will be-1.86%.