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Cantilever eigenfrequencies 
and quality factors 
of the nth oscillating mode for cantilevers P 5 and AF 11. The modal stiffness 
is obtained from the frequency shift noise spectral density 
through Equation 4. /
is the ratio of the modal stiffness of the nth oscillation mode to the stiffness of the fundamental mode.
| cantilever | n |
 (Hz) |
 |
 (N/m) |
 |
| P 5 | 1 | 436,711 | 44,900 | 154 | 45.3 |
| P 5 | 2 | 1,234,277 | 5841 | 1330 | 391 |
| AF 11 | 1 | 1,934,677 | 9000 | 3420 | 56 |
