Here are links to a few RTI/PTM data files for lithics; you will need the free RTIViewer software to see them (freely available at the Cultural Heritage Imaging website). You should right-click on the links and choose “Save As”, otherwise you will see bunch of weird text in your browser; in some browsers, Alt-click will also download the link directly. There are two kinds of RTI data files. *.ptm files are a fitting of a binomial quadratic equation to the light curve, while *.rti use a 2nd or 3rd order Legendre polynomial for the fit. *.rti files are a better fit, but there are more visualization modes available with *.ptm files. I have many more – contact me if there’s a point type you’d like to see (and that I have). Note: These files are up to about 70 MB in size; the modern obsidian point files are the largest (but are indicative of the kind of resolution you can get with this technique).
Modern obsidian point (PTM)
Modern obsidian point (RTI)