If the MULTIPLIERS option is selected for the THRESHOLD_TYPE parameter, the specified threshold factors are multiplicative factors of the median amplitude. Thresholds are computed as the product of the specified threshold factors and the median amplitude (Equation 8). If anomalously low amplitudes are being boosted, the threshold is computed by dividing the median amplitude by the specified threshold factor (see Equation 9). For example, if a threshold of 5 is specified, a frequency band is considered anomalous if its amplitude level is 5 times greater than the median amplitude. The threshold factors should normally be larger at the earlier times than at the later times because amplitude variability (spread) is usually greater at the beginning of the trace and decreases with time. (8)