Fig. 2.

Panels (a) and (b) display intensity and linear polarization for comet Garradd as a function of wavelength at a phase angle of 35.9° on Feb 2, 2012. Panels (c) and (d) display the integral intensity and the degree of linear polarization of the comet as a function of wavelength in the 3 × 10 arcsec area from the center of the comet. The position angle of the slit was 216.1°, implying that the slit was oriented perpendicularly to the extended Sun-comet radius vector.