  The SPectrogram Analysis and Cataloguing Environment (SPACE) tool is an
interactive python tool designed to label radio emission features of interest
in a time-frequency map (called 'dynamic spectrum'). The program uses
Matplotlib's Polygon Selector widget to allow a user to select and edit an
undefined number of vertices on top of the dynamic spectrum before closing the
shape (polygon). Multiple polygons may be drawn on any spectrum, and the
feature name along with the coordinates for each polygon vertex are saved into
a '.json' file as per the 'Time-Frequency Catalogue' (TFCat) format along with
other data such as the feature id, observer name, and data units. This paper
describes the first official stable release (version 2.0) of the tool.
