Layer Estimates:

Layer: lower (ID:0)
Count: 3
Extent:

XMin: -11969230.7692
YMin: 4761538.4615
XMax: -10315384.6154
YMax: 5915384.6154
Spatial Reference: 102100 (3857)

Layer: upper (ID:1)
Count: 3
Extent:

XMin: -12330769.2308
YMin: 2507692.3077
XMax: -11392307.6923
YMax: 3446153.8462
Spatial Reference: 102100 (3857)

Layer: proper (ID:2)
Count: 3
Extent:

XMin: -8823076.9231
YMin: 6000000
XMax: -8015384.6154
YMax: 7192307.6923
Spatial Reference: 102100 (3857)