Data for Figure 2

(X)		   (Y)
Frequency (Hz)	Pressure threshold (Pa)
1450                       386.69,
1452                       374.73
1454                       362.97
1456                       351.41
1458                       340.05
1460                       328.89
1462                       317.94
1464                       307.18
1466                       296.62
1468                       286.26,
1470                       276.11
1472                       266.15
1474                       256.4
1476                       246.84
1478                       237.49
1480                       228.33
1482                       219.38
1484                       210.63
1486                       202.07
1488                       193.72
1490                       185.57
1492                       177.62
1494                       169.87
1496                       162.33
1498                       154.98                       
1500                       147.83                   
1502                       140.89
1504                       134.15
1506                       127.6
1508                       121.26
1510                       115.13
1512                       109.19
1514                       103.46
1516                         97.928
1518                         92.6
1520                         87.476
1522                         82.555
1524                         77.838
1526                         73.326
1528                         69.018
1530                         64.916
1532                         61.02
1534                         57.33
1536                         53.847
1538                         50.572
1540                         47.505
1542                         44.647
1544                         41.999
1546                         39.56
1548                         37.33
1550                         35.31
1552                         33.498
1554                         31.893
1556                         30.494
1558                         29.298
1560                         28.302
1562                         27.503
1564                         26.897
1566                         26.481
1568                         26.251                            
1570                         26.203
1572                         26.335
1574                         26.647
1576                         27.136
1578                         27.804
1580                         28.651
1582                         29.68
1584                         30.893
1586                         32.292
1588                         33.879
1590                         35.659
1592                         37.632
1594                         39.801
1596                         42.168
1598                         44.734
1600                         47.501
1602                         50.469
1604                         53.64
1606                         57.013
1608                         60.59                    
1610                         64.369
1612                         68.353
1614                         72.539
1616                         76.929
1618                         81.523
1620                         86.32
1622                         91.319
1624                         96.522
1626                       101.93
1628                       107.54
1630                       113.35
1632                       119.36
1634                       125.58
1636                       132
1638                       138.62
1640                       145.44
1642                       152.46
1644                       159.69
1646                       167.12
1648                       174.75
1650                       182.58