[cobirds] Hummer ID help (Boulder)

Hi folks,

It's migrating hummingbird season at the Boulder Community Gardens at the moment.  I'd appreciate help with the ID of the attached bird. I'm torn between Black-chinned and Broad-tailed. The photos are of the same individual.

Reasons in favor of Black-chinned:

1. No visible rufous in the tail.  I saw the bird well with binoculars, but didn't get a photo of the bird in flight.
   
2. Limited rufous on flanks.
   
3. No white eye ring.
   
4. Grayish cap.
   
5. More vertical posture.
   

Reasons in favor of Broad-tailed:

1. Tail seems to extend further from wingtips than shown in Sibley.
   
2. Bill doesn't seem as curved as in Sibley.
   
3. Spots in cheeks.
   

Thanks,

Richard Trinkner

Boulder