The archives in this directory in tar and zip formats contain the same files. The images file archives are more than 4 GB in size, and the download time may be hours, even with a fast broadband connection: standard_transit.plotcfg 1M WASP-12b_example_calibrated_images.tar.gz 4431M WASP-12b_example_calibrated_images.zip 4541M WASP-12b_example_raw_biases.tar.gz 133M WASP-12b_example_raw_biases.zip 136M WASP-12b_example_raw_darks.tar.gz 136M WASP-12b_example_raw_darks.zip 139M WASP-12b_example_raw_flats.tar.gz 266M WASP-12b_example_raw_flats.zip 266M WASP-12b_example_uncalibrated_images.tar.gz 4454M WASP-12b_example_uncalibrated_images.zip 4493M The smaller biases, darks, and flats files will download quickly. We recommend that Linux and Mac OS users select the tar.gz format because they are over the 4GB limit of the usual unzip software on Unix-like systems. Use these commands to unpack files in Linux or OSX: tar xvf WASP-12b_example_images.tar.gz or alternatively 7z x WASP-12b_example_images.zip The 7-zip utility may be installed from Ubuntu and Opensuse package managers. It has unzip compatability with Winzip which was used to make the zip files.