Layer Estimates:

Layer: Boston Outline (ID:4)
Count: 2
Extent:

XMin: -7924970.7093
YMin: 5195179.9208
XMax: -7902148.3114
YMax: 5220649.161
Spatial Reference: 102100 (3857)

Layer: Needle Pickups by Census Tract (ID:1)
Count: 196
Extent:

XMin: -7923569.58527411
YMin: 5195184.97063381
XMax: -7903067.56361187
YMax: 5220649.16097359
Spatial Reference: 102100 (3857)

Layer: Boston Neighborhoods (ID:3)
Count: 26
Extent:

XMin: -7924973.6688
YMin: 5195182.1011
XMax: -7895087.8025
YMax: 5220632.7995
Spatial Reference: 102100 (3857)