Table 4

Boards with corresponding quality type, density, initial f ₀ before tuning, final f ₀ after tuning, and final thickness values. Initial thickenss is h ^initial = 4 mm for all boards. The boards’ identifiers are marked with “ID” numbers, coming from the trees being cut to produce them. The blue rows include the boards belonging to group S ₁, and the red rows include the boards belonging to S ₂. The corresponding IDs are also highlighted in bold in the table.

Board “ID”	Quality	ρ (kg m−1)	$f_0^{\mathrm{initial}}$ (Hz)	$f_0^{\mathrm{final}}$ (Hz)	h final (mm)
21	II	380	115	–	–
37	II	381	134	104	3.15
50	I	380	123	–	–
63	III	380	130	106	2.8
125	III	394	122	117	3.5
169	II	385	120	–	–
209	II	380	121	–	–
214	II	390	104	104	3.9
230	III	390	142	–	–
249	I	380	132	–	–
250	II	388	123	117	3.4
346	I	389	126	117	3.4