BOH36NCKFD4WDVQCSGQ2DKZILWDO7FF7MIDW3BLA7XTSGYHMKPNQC 5YIVNKFBLNHDKJKYUQ5JUFYGJTQIPOUVIOF5POW5PFG2ZBOMA3YAC XJQPEBJOU5JWQTYKVW6KJUGGZC26WNS7BA2AEID274NRF3WPUSCAC MF6A3QKQ6SU7PYAHJOO7YFCRB47DO7FHRA7OIZ7KHQJYJR77PAIQC DOME2A7KFYV4EH4RISTE5LMF6UF3U6KNNKPV6UGCKCM5PYEPOP5AC IFVRAERTCCDICNTYTG3TX2WASB6RXQQEJWWXQMQZJSQDQ3HLE5OQC D4W5FSXXDKYXSJGRO7D6VWG2LC5FB23DZMIK4FKNCTGO6TO54BQAC thin horizontal or gently diagonal streaks running across the mid-low frequency band (roughly 1/4 to 1/2 up from the bottom of the spectrogram); notes are sustained — they flow left to right as continuous lines rather than short vertical ticks; a phrase may start low and sweep upward, or hold steady at one frequency; multiple phrases may appear in one clip with short gaps between them; energy concentrated in a narrow horizontal band with little signal above mid-frequency; the pattern looks like ruled lines or scratches across the image, not dots or columns
thin horizontal or gently diagonal streaks in the mid-low frequency band (roughly 1/4 to 1/2 up from the bottom); notes flow left to right as continuous lines — NOT short vertical ticks or columns; a phrase may hold steady at one frequency or sweep upward slightly; IMPORTANT: the signal is often faint — even a single thin horizontal line or scratch visible against the background counts as song; real-field recordings are much quieter than studio refs, so look for the characteristic horizontal line shape even when it is barely visible; multiple phrases may appear per clip with short gaps between them; background noise fills the rest of the image — the streak stands out because of its horizontal orientation, not its brightness