Table 6: Frequency versus thermal gradient*.

Mode IMode IIMode IMode II

0.0240.47 60.84340.8785.87
240.4764.84348.7887.94

0.2228.1357.72322.1181.42
244.2461.78337.5684.81

0.4215.0854.42305.9976.88
231.6758.57325.9681.52

0.6201.9751.06284.0071.90
218.3755.16313.9578.03

0.8186.2647.13265.0566.19
204.2251.50301.7474.30

Results of the present paper are shown in bold text.