Layer Estimates:

Layer: Places of slave departure (ID:0)
Count: 124
Extent:

XMin: -2628995.3446743
YMin: -4076982.12807822
XMax: 6400870.72061324
YMax: 3849085.82130981
Spatial Reference: 102100 (3857)

Layer: Places of slave arrival (ID:1)
Count: 235
Extent:

XMin: -10703736.3940929
YMin: -4183295.69319167
XMax: 6400870.72061324
YMax: 6710219.08322075
Spatial Reference: 102100 (3857)

Layer: Places with most slave ship departures (ID:2)
Count: 9
Extent:

XMin: -196486.601441937
YMin: -1408366.85594425
XMax: 1493536.53858293
YMax: 702247.220517878
Spatial Reference: 102100 (3857)

Layer: Places with most slave ship arrivals (ID:3)
Count: 10
Extent:

XMin: -9170870.67941268
YMin: -2620751.55853297
XMax: -3878936.30376702
YMax: 3866580.22957788
Spatial Reference: 102100 (3857)

Layer: Countries with most disembarked slaves (ID:4)
Count: 8
Extent:

XMin: -11079019.7226298
YMin: -1155404.6277217
XMax: -5206742.59771102
YMax: 4705377.96414973
Spatial Reference: 102100 (3857)

Layer: Regions with most disembarked slaves (ID:5)
Count: 5
Extent:

XMin: -9468546.96648833
YMin: -1139037.2095516
XMax: 1037668.72453211
YMax: 4867277.38619507
Spatial Reference: 102100 (3857)

Layer: Ocean currents (ID:6)
Count: 54
Extent:

XMin: -10632670.6884007
YMin: -6754788.09951217
XMax: 4697281.73993596
YMax: 11734892.4958015
Spatial Reference: 102100 (3857)

Layer: Trade winds (ID:7)
Count: 34
Extent:

XMin: -10495374.3542736
YMin: -4746497.64136252
XMax: 1519600.02421419
YMax: 9398783.27010857
Spatial Reference: 102100 (3857)

Layer: Most used slave trade routes (ID:8)
Count: 10
Extent:

XMin: -8551369.60830995
YMin: -2620751.4758717
XMax: 1493536.53691313
YMax: 2243438.39321718
Spatial Reference: 102100 (3857)

Layer: Continents (ID:9)
Count: 189
Extent:

XMin: -19942048.7042682
YMin: -7541489.39291577
XMax: 20027119.1170185
YMax: 18428629.1455118
Spatial Reference: 102100 (3857)