What are the units in the reduced spectra?
• Normally and for the vast majority of cases, the -c option is not used. In that case, the column gives the UN-NORMALIZED Stokes parameter (for example, V/I * I, where I is the intensity). Therefore, it can go from -I to I: • the un-normalized Stokes parameter will be between -1 and 1 if I • the un-normalized Stokes parameter will higher than 1 in EMISSION lines (where the intensity is higher than 1) • When the -c option is used (to get the continuum polarization), the column gives the NORMALIZED Stokes parameter (for example, V/I), and will be between -1 and 1 (so, 0.10 is 10% polarization) Guiding (with either the ESPaDOnS guider or the Cass guider) does not keep the star centered in the hole, I’m losing flux, what can I do? At some telescope positions (especially at high airmass or high Hour Angle), the telescope can start to “oscillate”, usually in Declination. If too much flux is lost or the star really moves around too much, it is always possible to stop all guiding, and just us
