This paper was published online on 3 September 2010 with typographical errors in some of the text, figure labels, and captions. On page 1, right-hand column, the third line up from the bottom should read as "...from 1800 to 3050 μV K~(-1) for x=0.01 to x=0.017."; on page 2, left-hand column, the thirteenth line should read as "for GaAs to nearly 200 K for GaAs_(1-x) N_x with x=0.017." The sixth line of the caption for Fig. 2 should read as "nearly 200 K for GaAs_(1-x)N_x with x=0.017." The labels in Fig. 1 should read from top to bottom as "GaAsN x=0.010; GaAsN x=0.013; GaAsN x=0.017"; the labels in Fig. 2(a) should read as "GaAsN x=0.010; GaAsN x=0.013; GaAsN x=0.017". The text and figures have been corrected as of 20 October 2010, The text is correct in the printed version. Figures 1 and 2 are correct in the online version of the journal only, and are printed below for the benefit of the print readership,
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