Table 4.

Code and value distribution

No	Code		Value
	X1	X2	X1 (mg)	X2 (mL)
1	+1	+1	3.6	13.5
2	+1	−1	3.6	6.5
3	−1	+1	1.4	13.5
4	−1	−1	1.4	6.5
5	+1.414	0	4	12.5
6	−1.414	0	1	12.5
7	0	+1.414	2.5	15
8	0	−1.414	2.5	5
9–13	0	0	2.5	12.5

Notes: X₁, the amount of harmine; X₂, the hydration volume.