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  0.232642129
  5307.79883  0.17993103
  5443.58203  0.0700495243
  5551.021  0.250682443
  5665.11621  0.148606524
  5785.53076  0.327919304
  5872.9668  0.0373335443
  5943.37695  0.161123797
  6010.17822  0.162614703
  6078.64697  0.154822782
  6139.24121  0.177955583
  6190.88086  0.050243549
  6236.56104  0.0740621239
  6284.60986  0.0392079428
  6328.46924  0.121396929
  6369.02979  0.0954282656
  6409.64307  0.0499540307
  6450.  0.0415893346
  6490.47021  0.0347039886
  6531.18018  0.0444458351
  6571.39697  0.0884495974
  6611.88916  0.157391936
  6652.5  0.153190508
  6692.85498  0.192444056
  6735.93604  0.225137815
  6784.06299  0.336296171
  6830.38281  0.39586705
  6881.45801  0.29910633
  6933.18311  0.363071412
  6976.58789  0.308059365
  7017.25195  0.446088344
  7057.71582  0.210869282
  7098.24219  0.182519436
  7134.12305  0.308960736
  7168.72119  0.374365866
  7201.88281  0.323851258
  7236.45215  0.344507247
  7268.93408  0.290110797
  7304.04102  0.351082712
  7336.32812  0.38743028
  7371.35107  0.308189958
  7403.62207  0.37410745
  7440.93408  0.369134486
  7485.49414  0.69010818
  7535.91211  0.490065008
  7601.89209  0.213548258
  7677.47607  0.13869229
  7718.97412  0.137531534
  7759.396  0.128002316
  7800.24707  0.162639603
  7840.19287  0.169955298
  7880.55713  0.238542825
  7921.25195  0.357762903
  7964.03418  0.627141356
  8014.63721  0.817820013
  8071.93018  1.24751604
  8142.48584  1.83887398
  8228.45117  0.992334902
  8308.00586  0.0806490108
  8365.25293  0.133213162
  8403.70215  0.124196649
  8433.99609  0.0877655819
  8460.8584  0.0524021387
  8485.92578  0.10562031
  8503.93848  0.0375501178
  8526.44824  0.126312122
  8544.4209  0.130945638
  8561.90039  0.0596533082
  8575.40039  0.150052443
  8588.90039  0.198813304
  8602.40039  0.117573395
  8615.90039  0.103356086
  8629.40039  0.125396281
  8642.90039  0.189868882
  8656.40039  0.0992500931
  8669.90039  0.0854036957
  8683.40039  0.101817369
  8701.59082  0.0885831267
  8719.58398  0.0261399876
  8742.04492  0.060212642
  8760.00781  0.117475748
  8782.46191  0.0521756932
  8805.19043  0.107530758
  8832.42969  0.0940248519
  8859.49707  0.0565074272
  8886.44531  0.236977041
  8913.34473  0.239262134
  8942.47461  0.187143728
  8979.93066  0.0505583249
  9020.95801  0.0540992059
  9064.57031  0.057358738
  9111.64648  0.291815102
  9160.51758  0.221637607
  9203.87305  0.107091956
  9243.96582  0.0483839735
  9286.29004  0.217586771
  9346.90137  0.135504797
  9423.75391  0.445441097
  9509.68848  0.208458349
  9600.93262  0.109161496
  9699.29297  0.38729921
  9803.44727  0.214863285
  9921.70508  0.837031186
  10059.1826  0.932700455