I have not corrected for the heliocentric redshift in these data.

**************************************************
Perr must stand for photon noise error.
I assume no reddening correction either

NGC 628 = M74
heliocentric velocity
from lines in sn spectra  +631 km/s  iauc 7822 S. Smartt & P. Meikle
from Leda  in radio       +656 km/s
from Leda  in optical     +639 km/s
from Leda  mean           +656 km/s

Foreground extinction in
B from Leda/Schlegel   0.30
E(B-V)=.30/4           0.075
E(B-V)=.30/4.1         0.073  See Cardelli p. 249
Paolo E(B-V)           0.08


**********************************************

Polarization  2002 feb 8

lambda(A), q(%), u(%), P(%), theta(deg), Perr.

END:
  5121.86377 -0.419400007
  5402.63281 -0.638000011
  5569.5 -0.738200009
  5744.99316 -0.426699996
  5884.21289 -0.699100018
  5983.55518 -0.6505
  6079.13916 -0.611599982
  6167.88477 -0.520699978
  6240.07715 -0.525300026
  6307.79883 -0.54519999
  6375.1748 -0.651899993
  6442.53906 -0.590600014
  6510.11523 -0.621599972
  6577.08105 -0.645200014
  6644.73877 -0.522099972
  6711.979 -0.681100011
  6779.68799 -0.861400008
  6852.43604 -0.888700008
  6929.81689 -0.73269999
  6996.14795 -0.925300002
  7056.90283 -0.738799989
  7110.95801 -0.695500016
  7164.8252 -0.85650003
  7219.06494 -0.758000016
  7265.9751 -0.611199975
  7306.38623 -0.823700011
  7346.68115 -0.80400002
  7393.36084 -0.698700011
  7453.45117 -1.05239999
  7527.29492 -0.891700029
  7638.97314 -0.317999989
  7718.26416 -0.695800006
  7772.17822 -0.339399993
  7826.00098 -0.543500006
  7879.68604 -0.664300025
  7940.12012 -0.933099985
  8013.5918 -1.31289995
  8106.47412 -1.96329999
  8225.24023 -1.39890003
  8329.55469 -0.566799998
  8394.82129 -0.514199972
  8441.2168 -0.351799995
  8481.52344 -0.526000023
  8514.94727 -0.508099973
  8541.8584 -0.392100006
  8568.7998 -0.361600012
  8595.65039 -0.446799994
  8622.61523 -0.488599986
  8649.5752 -0.463800013
  8676.56543 -0.460599989
  8703.53418 -0.319000006
  8730.45215 -0.582700014
  8757.42188 -0.434399992
  8790.76367 -0.316799998
  8831.62988 -0.41839999
  8872.14453 -0.268299997
  8912.52734 -0.107199997
  8959.26172 -0.381300002
  9013.99805 -0.390700012