A new web page that explains the setup of the solar experiment to measure solar oscillations using FIES by observing the blue sky with a bare fibre can be found here:
http://www.not.iac.es/instruments/fies/staff/solarexp.htmlThe experiment has been run on various occasions and from an analysis of the data short-term radial-velocity stability from blue-sky measurements was measured with a scatter of only 3m/s.