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Table 2 The table shows the relative frequency change, by adding 0.5 μm to the liquid film thickness h . Considering the \(\pmb{f_{0}}\) listed in Table  3 , these numbers represent frequency changes of the order 10 \(\pmb{^{2}}\) -10 \(\pmb{^{3}\mbox{ Hz}}\)

From: Reconstruction of annular bi-layered media in cylindrical waveguide section

Mode Relative tunability h  = 1 mm Relative tunability h  = 2 mm
TE110 3.70110−6 5.10710−6
TE210 7.45210−6 1.29310−5
Quarter wave 1.52010−5 1.05910−5