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  35.2325439
  5307.79883  168.587708
  5443.58203  9.07867622
  5551.021  164.520477
  5665.11621  136.67485
  5785.53076  33.4197502
  5872.9668  50.6815948
  5943.37695  124.322968
  6010.17822  142.331329
  6078.64697  155.974869
  6139.24121  174.470245
  6190.88086  4.33921289
  6236.56104  92.0616226
  6284.60986  48.867363
  6328.46924  20.9530849
  6369.02979  8.14232635
  6409.64307  73.3718796
  6450.  130.180634
  6490.47021  79.9197464
  6531.18018  71.9561234
  6571.39697  162.544067
  6611.88916  12.6242723
  6652.5  0.589746475
  6692.85498  169.006287
  6735.93604  153.734879
  6784.06299  140.489548
  6830.38281  144.551178
  6881.45801  151.593796
  6933.18311  150.496826
  6976.58789  140.271347
  7017.25195  144.417496
  7057.71582  148.97879
  7098.24219  148.733841
  7134.12305  153.047272
  7168.72119  155.791138
  7201.88281  148.40239
  7236.45215  151.434875
  7268.93408  166.470062
  7304.04102  150.799423
  7336.32812  146.680481
  7371.35107  148.03244
  7403.62207  160.884583
  7440.93408  136.520752
  7485.49414  151.750183
  7535.91211  145.978745
  7601.89209  14.7532434
  7677.47607  97.0368729
  7718.97412  121.629761
  7759.396  62.9376907
  7800.24707  52.0572433
  7840.19287  126.851738
  7880.55713  128.933395
  7921.25195  129.390961
  7964.03418  139.124146
  8014.63721  140.805954
  8071.93018  144.478134
  8142.48584  142.267319
  8228.45117  149.790558
  8308.00586  139.718597
  8365.25293  159.727402
  8403.70215  8.72115612
  8433.99609  39.3541298
  8460.8584  175.598846
  8485.92578  62.2296829
  8503.93848  128.693451
  8526.44824  60.7962418
  8544.4209  81.8704834
  8561.90039  119.886528
  8575.40039  28.966301
  8588.90039  27.8805161
  8602.40039  135.671951
  8615.90039  137.568268
  8629.40039  71.5018616
  8642.90039  139.950134
  8656.40039  113.864403
  8669.90039  79.6251755
  8683.40039  127.495178
  8701.59082  69.9274521
  8719.58398  3.49060893
  8742.04492  154.122055
  8760.00781  171.327271
  8782.46191  7.78775549
  8805.19043  17.127985
  8832.42969  148.559357
  8859.49707  75.9563828
  8886.44531  51.9167671
  8913.34473  54.4712524
  8942.47461  82.2534027
  8979.93066  142.000931
  9020.95801  131.923859
  9064.57031  60.4204483
  9111.64648  143.076569
  9160.51758  172.518204
  9203.87305  170.639297
  9243.96582  110.89782
  9286.29004  151.415283
  9346.90137  126.627907
  9423.75391  164.963379
  9509.68848  177.023453
  9600.93262  126.762917
  9699.29297  149.975037
  9803.44727  136.563156
  9921.70508  128.439636
  10059.1826  148.908386