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Repeatability test of the proposed SIW chemical sensor for methanol and acetone: (a) frequency variation of test #1 (fast injection and extraction process); (b) frequency variation of test #2 (slow injection and extraction process); (c) measured reflection coefficients of test #1 with methanol; (d) measured reflection coefficients of test #2 with methanol; (e) measured reflection coefficients of test #1 with acetone; (f) measured reflection coefficients of test #2 with acetone.
