Comparison between the CCM and new extinction laws for two extinguished Galactic O stars with 2MASS and Strömgren photometry (the first one also with Cousins RI) processed with CHORIZOS. The blue points with error bars (horizontal for indicative filter extent, vertical for uncertainty) show the input photometry used for the fit. Red and orange are used for the SEDs and synthetic photometry derived with the CCM extinction laws while black and green are used for the same quantities derived with the new extinction laws. The values for R₅₄₉₅ and E(4405 − 5495) above are the ones derived with the new extinction laws.