PAVO is an integral-field-unit for measuring spatially-modulated fringes in the pupil plane.  It spectrally disperses light over a 630-950 nm bandwidth (R = 30).  PAVO can combine the light from two to three telescopes. 

Currently PAVO is commissioned for two-telescope operations.  The data reduction pipeline is not yet calibrated for three-telescope data.

PAVO Instrument Paper (pdf) - Ireland, M. et al. 2008, SPIE, 7013, 24