Help with Chipotle calories?

Alright, so today I went to a Chipotle for the first time in my life and was pleasantly surprised to find a range of calorie estimates for each order (320-620). However, the order apparently included three (I thought it'd be just one-- I ordered soft tacos with chicken, romaine lettuce, salsa, and cheese). Now, would the range of 320-620 be per taco or per order? Thanks!