There are no crackles in this subject. The bar graph shows the crackle rate in each 1/3 of inspiration and expiration. Two top bar graphs represent lung apex, channels 1 and 2 on the right and channels 9 and 10 on the left. Two bottom bar graphs summarize information from the lung bases, microphones 3 through 7 on the right and 11 through 15 on the left. Since tracheal crackles are uncommon STG does not identify crackles at the trachea.

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