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  116.959
  5307.79883  128.201004
  5443.58203  122.315002
  5551.021  130.781998
  5665.11621  123.094002
  5785.53076  116.320999
  5872.9668  118.819
  5943.37695  120.885002
  6010.17822  124.390999
  6078.64697  126.186996
  6139.24121  128.313004
  6190.88086  121.905998
  6236.56104  117.345001
  6284.60986  118.829002
  6328.46924  122.154999
  6369.02979  123.444
  6409.64307  117.664001
  6450.  120.636002
  6490.47021  118.414001
  6531.18018  117.910004
  6571.39697  124.077003
  6611.88916  125.329002
  6652.5  127.008003
  6692.85498  129.154007
  6735.93604  128.417007
  6784.06299  127.248001
  6830.38281  129.632996
  6881.45801  130.046997
  6933.18311  131.225998
  6976.58789  126.824997
  7017.25195  130.421005
  7057.71582  127.178001
  7098.24219  126.350998
  7134.12305  130.873001
  7168.72119  133.460007
  7201.88281  129.850006
  7236.45215  131.324005
  7268.93408  133.649994
  7304.04102  131.309998
  7336.32812  130.570999
  7371.35107  129.496994
  7403.62207  135.369003
  7440.93408  126.466003
  7485.49414  137.641998
  7535.91211  132.035995
  7601.89209  128.067001
  7677.47607  115.649002
  7718.97412  120.323997
  7759.396  113.389999
  7800.24707  112.639999
  7840.19287  121.622002
  7880.55713  122.716003
  7921.25195  123.732002
  7964.03418  130.320999
  8014.63721  132.671005
  8071.93018  137.427994
  8142.48584  137.524002
  8228.45117  139.925995
  8308.00586  122.524002
  8365.25293  126.829002
  8403.70215  125.647003
  8433.99609  118.113998
  8460.8584  122.848999
  8485.92578  114.171997
  8503.93848  120.591003
  8526.44824  112.987999
  8544.4209  113.316002
  8561.90039  119.987
  8575.40039  120.435997
  8588.90039  121.389
  8602.40039  122.904999
  8615.90039  122.905998
  8629.40039  112.781998
  8642.90039  125.356003
  8656.40039  118.984001
  8669.90039  115.309998
  8683.40039  121.268997
  8701.59082  114.842003
  8719.58398  121.251999
  8742.04492  123.098999
  8760.00781  126.917
  8782.46191  122.305
  8805.19043  123.402
  8832.42969  124.179001
  8859.49707  116.693001
  8886.44531  106.150002
  8913.34473  105.474998
  8942.47461  110.514999
  8979.93066  121.954002
  9020.95801  121.195
  9064.57031  116.788002
  9111.64648  128.694
  9160.51758  133.798996
  9203.87305  126.662003
  9243.96582  119.149002
  9286.29004  129.552994
  9346.90137  121.514
  9423.75391  142.294998
  9509.68848  133.889008
  9600.93262  121.336998
  9699.29297  134.026001
  9803.44727  125.459
  9921.70508  125.620003
  10059.1826  140.453003