City+ means the coffee has cleared first crack, and time is allowed for an even bean surface appearance to develop.
There are only very small changes between the #9 picture above and this one, notably the edges of the bean are a bit softer. The whole stage between the first and second crack is a short period ( 15 to 30 seconds) where a lot is happening chemically to the beans. The coffee gains heat once again until its woody cellulose matrix, the bean structure itself, begins to fracture ... that is, the Second Crack