Item --- Location --- Channel option aggregates your data first by channel, then by location, and then, by item (see figure below).

Item --- Channel --- Location option aggregates your data by location, channel, and then, by item.

Location --- Item --- Channel option groups your data by channel, item, and then, by location.

Location --- Channel --- Item option aggregates the data by item, channel, and then, by location.

Channel --- Item --- Location option groups your data by location, item, and then, by channel.

Channel --- Location --- Item option aggregates the data by item, location, and then, by channel.

Tracedump:

newBaseSize: 16pt
newBaseSizeInPt: 16