Getting a Trendline
It's quite easy to get a trend-line from the web-interface of ARDI.
Step 1: Find the Asset
Find your asset, then open the dashboard.
Step 2: Click on the Property
Find the box that contains the property you're interested in, and click on it.
Complete
And you've finished - you've got a trend-line of your asset property.
If you need a line from history, you'll need to use the time-travel control to specify the time-frame you're interested in.