False negative examples from the PRESTO single pulse search pipeline on data sets in which fake FRB signals have been injected. The sub-panels are described in the text. (a) The candidate detected by the PRESTO pipeline has a DM of 3962 pc cm−3, whereas the actual signal has a DM of 300 pc cm−3. (b) The S/N of a signal is distorted by RFI, which leads to a low S/N value for the FRB event.
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