When the AMP_DISTRIBUTION port is connected, a single distribution for the entire data set is computed and plotted in the printout. This distribution plot indicates the cumulative percentiles of each sample, including the threshold sample. The percentile at the threshold should normally be between 95 and 98. Data sets that have noise prevalent throughout the data set might require thresholds that reach the 90th percentile. Several useful trace header literals are optionally inserted in the seismic data output through the FILTERED_SEISMIC port. These literals can be averaged across the gather using the Gather Header Math (GATHER_HDR_MATH) SFM, and then plotted using a viewing application such as ATTRIBUTE_DISPLAY. If a numeric value is specified for the BANDS_NEAR_THRESHOLD parameter, it specifies a tolerance around the threshold (defined as a percentage of the threshold value) that is searched to determine how many frequency bands are within this tolerance (near the threshold). The TR.ANA_TRSH_MORE trace header literal contains the percentage of frequency bands that have amplitudes that are greater than their respective thresholds. Subtracting thee values of this literal from 100 gives the average percentile of the thresholds for all frequency bands of the trace. The TR.ANA_TRSH_LESS_PCT trace header literal contains the percentage of bands within the specified tolerance that have amplitudes that are smaller than the threshold. The TR.ANA_TRSH_MORE_PCT trace header literal contains the percentage of bands within the specified tolerance that have amplitudes that are larger than the threshold. Large values for these literals indicate areas where the threshold factor might need to be increased. A large value for the TR.ANA_TRSH_MORE literal is 10 or more. A large value for the TR.ANA_TRSH_MORE_PCT and TR.ANA_TRSH_LESS_PCT literals depends on the BANDS_NEAR_THRESHOLD parameter. In general, the TR.ANA_TRSH_MORE_PCT and TR.ANA_TRSH_LESS_PCT literals should be less than the value specified for the BANDS_NEAR_THRESHOLD parameter.