TAI is one realization of TT that must be determined instantly from a world-wide network of atomic clocks. As expected, after-the-fact analysis of the world-wide atomic clock data allows determination of better realizations of TT, and the ttbipm.dat file contains one such corrected realization. This file is obtained by, e.g., wget ftp://ftp2.bipm.fr/pub/tai/scale/ttbipm.08 mv ttbipm.08 ttbipm.dat The files ttbipm.nn tend to be published early in the year nn+1, (i.e., the year 2009 for the ttbipm.08 file) so yearly downloads are required to keep ttbipm.dat up to date. For each ttbipm.nn file, there exists some header lines (30 of them for ttbipm.08) that must be skipped before actual data appear in the file. Thus, the NSKIP_LINES variable that appears in CMakeLists.dat must be confirmed/reviewed each year after the download of ttbipm.nn.