Table 1.

Geometric characteristics of axon terminals reconstructed¹ for simulations

Subsystem	V (μm)³	Surface area (μm)²	Available³ surface area (μm)²
DA axons
Terminal 1	1.22	6.8	5.47
Terminal 2	24.63	59.47	53.83
Terminal 3	3.53	20.18	18.03
Terminal 4	15.84	56.33	51.11
Terminal 5	4.72	25.14	25.14
Terminal 6	1.71	10.12	10.12
Terminal 7	0.82	5.57	5.57
Terminal 8	2.04	12.94	12.94
Terminal 9	15.32	46.86	39.08
Terminal 10	15.18	58.65	55.5
Terminal 11	3.85	18.99	18.98
Terminal 12	9.69	34.31	31.75
Terminal 13	2.58	12.35	9.64
Total for all terminals	101.03	367.71	337.16
Non–DA-expressing cells	463.62	1058.00	0
DA axons + other cells	564.65	1425.71	337.16
Available EC volume²	155.35

↵1 Using experimental data from Block et al. (2015).
↵2 Obtained by subtracting 564.65 from 720 μm³ (for the simulation box of 10 × 10 × 7.2 μm³).
↵3 Excluding those at the simulation box boundaries.