Figure 3: Average noise levels of the four seating sections as a function of the audible frequency range in the human ear: a solid line for LZeq, a thick dashed line for LZFmax, and a light dashed line for LZFmin. Generally, the levels between 0.05 and 1 kHz were significantly higher than other frequencies, but they abruptly decreased above 1 kHz. Although the values of LZFmin were not substantially different in the four sections across the frequencies, the red and navy sections were distinguishably higher level than the outfield section in LZeq.