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:
  5059.97803 -0.234699994
  5307.79883 -0.148699999
  5443.58203 -0.248400003
  5551.021 -0.100000001
  5665.11621 -0.305999994
  5785.53076 -0.185100004
  5872.9668 -0.320800006
  5943.37695 -0.371499985
  6010.17822 -0.270999998
  6078.64697 -0.207900003
  6139.24121 -0.136000007
  6190.88086 -0.26030001
  6236.56104 -0.38319999
  6284.60986 -0.313899994
  6328.46924 -0.217600003
  6369.02979 -0.215700001
  6409.64307 -0.348399997
  6450. -0.312900007
  6490.47021 -0.337799996
  6531.18018 -0.34040001
  6571.39697 -0.231199995
  6611.88916 -0.160600007
  6652.5 -0.149000004
  6692.85498 -0.122900002
  6735.93604 -0.163499996
  6784.06299 -0.235400006
  6830.38281 -0.168899998
  6881.45801 -0.133599997
  6933.18311 -0.109200001
  6976.58789 -0.238800004
  7017.25195 -0.150199994
  7057.71582 -0.194399998
  7098.24219 -0.208100006
  7134.12305 -0.109399997
  7168.72119 -0.0421000011
  7201.88281 -0.143700004
  7236.45215 -0.101899996
  7268.93408 -0.0296999998
  7304.04102 -0.103200004
  7336.32812 -0.132699996
  7371.35107 -0.150000006
  7403.62207  0.00930000003
  7440.93408 -0.263999999
  7485.49414  0.0984999985
  7535.91211 -0.0978000015
  7601.89209 -0.0934000015
  7677.47607 -0.41170001
  7718.97412 -0.337900013
  7759.396 -0.349900007
  7800.24707 -0.3134
  7840.19287 -0.320300013
  7880.55713 -0.32159999
  7921.25195 -0.339899987
  7964.03418 -0.179100007
  8014.63721 -0.103
  8071.93018  0.139300004
  8142.48584  0.197600007
  8228.45117  0.228499994
  8308.00586 -0.245800003
  8365.25293 -0.156100005
  8403.70215 -0.137700006
  8433.99609 -0.238100007
  8460.8584 -0.202700004
  8485.92578 -0.313499987
  8503.93848 -0.261400014
  8526.44824 -0.318699986
  8544.4209 -0.377700001
  8561.90039 -0.281500012
  8575.40039 -0.171399996
  8588.90039 -0.138799995
  8602.40039 -0.247500002
  8615.90039 -0.240600005
  8629.40039 -0.349599987
  8642.90039 -0.216399997
  8656.40039 -0.315400004
  8669.90039 -0.328099996
  8683.40039 -0.274199992
  8701.59082 -0.314999998
  8719.58398 -0.220799997
  8742.04492 -0.208800003
  8760.00781 -0.133399993
  8782.46191 -0.194600001
  8805.19043 -0.155300006
  8832.42969 -0.200499997
  8859.49707 -0.292400002
  8886.44531 -0.298400015
  8913.34473 -0.318599999
  8942.47461 -0.420399994
  8979.93066 -0.226699993
  9020.95801 -0.243499994
  9064.57031 -0.265799999
  9111.64648 -0.153799996
  9160.51758 -0.0194000006
  9203.87305 -0.130799994
  9243.96582 -0.267100006
  9286.29004 -0.1118
  9346.90137 -0.26699999
  9423.75391  0.159799993
  9509.68848 -0.0157999992
  9600.93262 -0.251399994
  9699.29297 -0.0241999999
  9803.44727 -0.202800006
  9921.70508 -0.40110001
  10059.1826  0.228100002