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. 2005 Fall;9(4):199–226. doi: 10.1177/108471380500900404

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Figure 6. — The mean difference between real-ear-to-coupler difference (RECD) values that were measured using the gold standard procedure (ER3A Insert Earphone [10 ohm]/HA2 2-cc coupler) and five other RECD measurement transducers as a function of frequency for 15 subjects. Panel A shows results when the custom earmold used has 35 mm of tubing. Panel B shows results when the custom earmold used has 45 mm of tubing. A value closer to 0 indicates little difference between the two measurement conditions was noted.