Tau Boo observing by SARG

Echelle spetctrum of the solar type star Tau Boo (F6 V) taken with SARG@TNG in the 9 June night. The spectrum was taken with the red grism (spectral coverage 450 - 1030 nm) at a resolution of 115,000; the spectrum was binned (4X1) along the cross dispersion. The exposure time was 2 min. (among clouds) and S/N is about 200. The gap between the two chips is about 0.4 mm ( ~ 4 nm in wavelength with this cross disperser). In the reddest part of the spectrum the grism second order is visible because the spectrum was taken without the stray light soppression filter available on the filter wheel.