If you click  here  and  here   you can see the graphs.

By moving the mouse you can read the coordinates of the points on the graph.
You can have these files used by directing students to:
http://macosa.dima.unige.it/handbook/graph_php/sin1xx.php
http://macosa.dima.unige.it/handbook/graph_php/sin1xxx.php
or you can save them (with extension ".php", possibly changing the names) in any computer.

See this document for other "php" charts, for more information on them, and to see how to change them.