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(a) This example illustrates the lack of response of the RCM filter to a noise-free monotonic signal; despite the significant and non-linear trend in the data, the median is equal to the center value, and the filter will return to zero. (b) The response of the RCM filter to a signal with a monotonic trend and a peak. In contrast to the monotonic signal alone, there is a clear difference between the median and the center value.
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