[amibroker] End of week closing moving average...

[garyniemen]

Hi there,
Probably an easy question for some of you guys.
How do I set up a chart showing the end-of-week weekly moving average 
across 40 weeks. In other words, not daily moving average - but weekly 
moving average at close on each Friday and then based on 40 weeks.
Apologies in advance if this is obvious and I am missing something.
Regards
Gary Niemen