Galactic + M101 ISP correction is based on an "Epoch 6" observations of
SN2011fe made between 2011 December 27 and 2012 January 1 UT at the Steward
Observatory 61" Kuiper Telescope with the SPOL spectropolarimeter.

The adopted ISP in the sightline to SN2011fe is:

q_max = -0.0014708                  P = 0.196% +/- 0.044%
u_max =  0.0012995                  theta = 69.27 +/- 6.4 degrees

where it is assumed that the wavelength of maximum ISP is at 5550 Angstroms.
The ISP spectrum is assumed to follow a Serkowski law.

The spectra ISP_epoch6.q and ISP_epoch6.u within this directory show the
adopted ISP from 4000 to 7550 Angstroms.

These results are the average of 6 observations and the uncertainties 
listed above are the standard deviation of these observations.