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The spectrograph is designed to be usable over the range from 3000 Å
to 1.1 
m. However, it is unfortunately not possible to cover this
entire range at once.
Tabs. 15 and 16 summarise
the free spectral range and order separation at a variety of
wavelengths, and can be used to calculate the number of orders
that will fit on the detector simultaneously, and to check whether
the detector can cover the entire length of the orders.
This is discussed in more detail in Section 12.
Additionally the STARLINK released programme ECHWIND (see
Starlink User Guide No. ??) gives a graphical representation of the
detector coverage of the echellogram at any particular echelle central
wavelength. (see also Chap. x.)