2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12247We present a method of subtracting the foreground contamination for the measurement of CMB polarization. We calculate the resultant errors on CMB polarization and temperature-polarization cross correlation power spectra for the high frequency instrument (HFI) aboard Planck Surveyor, and estimate the corresponding errors on cosmological parameters.Latex document, 4 pages, 1 figure, to appear in "Fundamental parameters in Cosmology", Rencontres de Moriond, 1998 figures correctedAstrophysicstext