port length				
Db	0.018	0.0381	0.0762	0.1524	0.3048
50	75	76	77.9	81.3	84
55	78.7	80.1	82	84.5	86.7
60	79.2	82.1	84.9	87.4	89
65	81.8	85.1	87.8	89.8	90.7
70	83.9	87.1	89.6	90.9	91
75	84	87.3	89.6	90	89.7
80	84.5	88	89.7	89.1	88.6
85	87.1	90.3	90.7	89.4	88.7
90	91.2	93.2	92.1	90.3	89.6
95	94.4	94.5	92.5	90.6	89.8
100	95.9	94.3	91.9	90.1	89.4
105	97.4	94.8	92.6	90.9	90.3
110	96.3	93.6	91.6	90.1	89.5
115	92.4	90	88.3	87.1	87
120	93.6	91.6	90.2	89.3	89
125	96	94.5	93.4	92.4	92
130	95.4	93.9	92.8	91.9	91.5
135	91.1	89.8	88.8	88.1	87.8
140	89.7	88.7	87.7	87.1	87.1
145	89.2	88.5	87.5	87	87
150	87.7	87.2	86.4	85.9	86.2