NOTE: make sure that there is at least 50GB of available disk space.

First, combine the parts for the raw data:
>>> cat data_repository_data.tgz.part* > data_repository_data.tgz

Then, untar the .tgz files:
>>> tar -xvzf data_repository_data.tgz
>>> tar -xvzf data_repository_processeddata_plots.tgz
>>> tar -xvzf data_repository_codes.tgz