Menu Selection 14 can be used to analyze the phase fractions present as a function of distance from an aggregate surface, for microstructures that were originally created containing an aggregate particle. The user supplies the name of the microstructure to be analyzed, and a file with an .agg extension replacing the .img portion of the submitted filename is created containing the quantitative phase count results. In addition, if the user provides their e-mail address, this same file will be sent to them for further analysis and plotting, in their own spreadsheet package for example. For each incremental pixel distance away from the aggregate, the file lists the distance in pixels and the phase counts for phase IDs 0 (water-filled porosity) to 26 (fly ash) and phase IDs 35 (C3A in fly ash before hydration is executed) and 38 (empty porosity). All of the phases and their corresponding IDs are provided in Figure 11.