2) You will also need the tutorial data files found on the Period04 homepage. Download either tutorial.zip or tutorials.tar.gz. In this tutorial, we will use Period04 to examine a data set and determine the frequencies by using Fourier analyses to give us rough values of the frequencies. Pyriod aims to eventually provide most of the functionality of the wonderful program Period04 in the Python environment for the modern astronomy workflow,146, 2005 Period04 User Guide P. Lenz, M. Breger Department of Astronomy, Univ. Tutorials Launches the help system and shows the main page for the Period04 is a computer program especially dedicated to the statistical Period04 is a Java/C++ hybrid program. Tutorial data files, tutorial.zip Mini Tutorial Period04. Note: Period04 has a very complete tutorial that you can consult and learn more about this tool. to open. > period04. The tutorial (tutorial1.pdf) that comes with the software is an excellent guide for using Period04. The tutorial is simple to follow.