Tell the user about stacked sensors.
This is on behalf of Enrique Villalobos.
Specimen Authoring Tool
There should be a note (maybe a note that appears when you hover over the option at Sensor/Load Sensor data) that tells the user when sensors are imported into the Authoring Tool they will be stacked all on top of the other.
It was confusing for the attendees of the February 2013 Bootcamp at UC Berkeley, and in general for inexperienced users.