Frequency	10cm “left” of center	5cm “left” of center	center	5cm “right” of center	10 cm “right of center
50 Hz	70.2	73.4	75	73.7	70.3
100 Hz	70.8	73.6	75	74	70.8
150 Hz	70.1	73.5	75	73.8	70.1
200 Hz	70.1	73.6	75	73.7	70.1
250 Hz	70.3	73.5	75	73.4	70.2
300 Hz	70.6	73.6	75	74	70.7
350 Hz	69.8	73.6	75	73.9	70.2
400 Hz	70.2	73.7	75	73.8	69.6
450 Hz	70.2	73.6	75	74.1	70.6
500 Hz	70.3	73.6	75	74.1	70.4
550 Hz	70.1	73.5	75	73.5	69.9
750 Hz	70.2	73.5	75	73.7	69.6
1000 Hz	69.6	73.5	75	73.5	69.2
2000 Hz	70.5	73.4	75	73.8	71.4
3000 Hz	71	71.9	75	71.7	69.3
4000 Hz	69.8	70.4	75	71.2	71.5