passages.id: split_4_test_262_passage
passages.type: progene_text
passages.text: Five stimulus conditions were included in this study : fc = 1000 Hz , delta L = 3 dB ; fc = 1000 Hz , delta L = 1 dB ; fc = 2000 Hz , delta L = 3 dB ; fc = 2000 Hz , delta L = 1 dB ; and fc = 4000 Hz , delta L = 3 dB .