TV-guiding is possible either on the object itself by means of a dichroic mirror or with a field star avoiding the dichroic mirror.
Transmission curves are available as a separate file .
Generally the sensitivities do not depend strongly on the scale chosen. The long slit spectroscopic mode is now partially implemented using grisms. For a full description see the article by the undersigned in the ESO Messenger 78 . For practical considerations linked to source acquisition and centering of the source with respect to the slit stars with a continuum flux of less than 2Jy at N should only be observed in exceptional cases. The frontend provides for some basic information such as a quick-look colour display of the video data and the cumulated data of a series of integrations.