This is a modification to the synopsis entitled X-RAY PHOTOELECTRON SPECTROMETERMAINTENANCE, Solicitation No. NNG09282550L which was posted on February 24,2009. You arenotified that the following changes are made: This modification is to add the serial andmodel number of the spectrometer. Accordingly, Serial No.: 5547Model No.: E2703Surface Science M-ProbeThe due date for responses is not extended.Documents related to this procurement will be available over the Internet. Thesedocuments will reside on a World Wide Web (WWW) server, which may be accessed using a WWWbrowser application. The Internet site, or URL, for the NASA/GSFC Business Opportunitieshome page is http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=51 Offerors are responsible for monitoring this site for the release of the solicitation andany amendments. Potential offerors are responsible for downloading their own copy ofthe solicitation and amendments (if any).

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