1. A computer implemented system for generating a graphical representation of selected data from a raw data file having a plurality of data sets arranged according to a fixed format, including: a first processing sequence that extracts data from each data set of the raw data file according to a first plurality of commands specified by a user based on the fixed format of the raw data file and stores the extracted data in a plurality of output files having a common output file format; a second processing sequence that extracts data from at least two of the plurality of output files according to a second plurality of commands specified by the user based on the common output file format and stores the extracted data in a first data structure having a first data structure format; a third processing sequence that extracts data from the first data structure according to a third plurality of commands specified by the user based on the first data structure format and stores the extracted data in a second data structure having a second data structure format; a fourth processing sequence that generates a graphical representation of user-specified data in the second data structure.