run run number n mean refractive index used daero total length of the radiator(mm) thc measured Cherenkov angle (mrad) sigc measured width of the Cherenkov angle distribution (mrad) mean mean of the number of photons in +- 3sigc around thc np Number of photons (Poisson) np0, Number of photons (fit of the peak of Cherenkov angle distribution) nbkg number of background photons (fit) ac1 geometrical acceptance for full coverage of active surface me1, mean/ac1 np1, np/ac1 nf1, np0/ac1 nb1, nbkg/ac1 ac2, geometrical acceptance relative to infinite PMT array me2, mean/ac2 np2, mean/ac2 nf2, np0/ac2 nb2 nb/ac2 f: results for the 100% active area fpm: results for the full ring acceptance