The archive contains a few files that describe the experiment, the samplesthe antibodies used, and other information:

The antibody annotation file: information the antibodies used, the gene symbols, the slide IDs, etc.
The slide design file: information about locations of samples on slides, matched UUID and sample barcodes, etc.
The IDF file: information about the RPPA experiment (PI, date of experiment completion, date of public release, experiment protocols, etc.)
The SDRF file: relationship between slides, antibodies, samples, data files, etc.

