Polarity for PSSE14 compact switching power supply

I’ve just purchase a compact switching power supply PSSE14. The drawing that indicate the polarity is so small that I don’t know in which sense I have to plug the connector.
see image here:
lh3.googleusercontent.com/-SGb- … /53192.jpg
Please help me!

Polarity is also indicated on the connectors, but to be absolutely sure, we recommend to measure it with a multimeter.