Equalization is often unable to achieve flat frequency response at all listening locations in part because of the resonance (i.e., standing wave) patterns at low frequencies in nearly all rooms.
One of the first observations to emerge from this analysis is a major difference between the vibrational patterns at low frequencies (e.g., Figure 17) compared to high frequencies (Figures 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34).
This is a reasonable approximation for long sequences and patterns that occur at low frequencies.
Inconsistency, attributed to the source radiation pattern, was mainly observed at low frequencies at the seismological stations KEF1 and KEF3 for local small earthquakes as well as at the accelerometric stations LXR and CHV for the major events, possibly due to near-field effects.
Haplogroup X is one of the exceptions to this pattern of limited geographical distribution, and is found at low frequencies among West Eurasians[2], northern groups of Native Americans[3], as well as in northern Africa and the Near East[4].
Thus, in subsp. spontaneum, a general pattern of few frequent haplotypes per locus along with a series of many alleles at low frequencies was found (fig. 1).
At low frequencies, both the symmetric (0°) and anti-symmetric (180°) patterns appear to be stable.
Furthermore, patterning defects in addition to the lack of axillary shoots were observed at cauline nodes at low frequencies.
At low frequencies the polar plots are circular in planes containing the waveguide, but the radiation pattern develops lobes as the frequency increases.
This pattern could arise if selection acts against large genetic perturbations, such that variants of large effect would be present only at low frequencies.
