The missing pane

A couple of weeks ago Mr hazelh cracked a pane of glass when he was cleaning our windows. Today a glazier came to fix it. In this shot the glass has not been replaced. Can you guess which pane is missing?

While Mr hazelh was supervising this work I was checking all the arrangements for a forthcoming work trip to Canada and the US. I was very glad that I did this today when I discovered that my place at the conference that I am co-chairing had not been booked!!!

Exercise today: 1 long running loop (in a good time of 19'02"), sit-ups and weights, walk to work (10,463 steps).