AFS

An AFS, or arithmetic frequency sequence, is a kind of arithmetic and monotonic tuning.

example: (1/⁴√2)-shifted overtone series segment = 9-AFS(1/⁴√2)

quantity	1	2	3	4	5	6	7	8	9
frequency	1.00	1.84	2.68	3.52	4.36	5.20	6.05	6.89	7.73
pitch	0.00	0.88	1.42	1.82	2.13	2.38	2.60	2.78	2.95
length	1.00	0.54	0.37	0.28	0.23	0.19	0.17	0.15	0.13