1 Introduction

This document describes how to use PERIOD (version 5.0), a software package designed to search for periodicities in data. Version 5.0 is the successor to 4.2, of which it is a Double Precision implementation, also re-configured to utilise dynamic array allocation/deallocation for the majority of its input, output and work arrays.

This document is intended for use with the UNIX software (version 5.0). If you have previously used a VMS version, you should be aware that the UNIX is case-sensitive with regard to directory structure and file names. For this reason the instructions below are in lower case and may appear odd to those familiar with VMS.