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DEPTH DEFINITIONS:

Observed level/depth	The depth or pressure at which an in situ measurement was collected as reported by the originator of the data.
Standard level/depth	A depth below the sea surface at which water properties should be measured and reported, either directly or by interpolation. The standard depths recommended according to the proposal by the International Association of Physical Oceanography in 1936 are included, with additional depths of interest added - with more closely spaced depths nearer the surface.
	Depth (m) Level # Depth (m) Level # Depth (m) Level # Depth (m) Level # 0 1 475 36 2400 71 5900 106 5 2 500 37 2500 72 6000 107 10 3 550 38 2600 73 6100 108 15 4 600 39 2700 74 6200 109 20 5 650 40 2800 75 6300 110 25 6 700 41 2900 76 6400 111 30 7 750 42 3000 77 6500 112 35 8 800 43 3100 78 6600 113 40 9 850 44 3200 79 6700 114 45 10 900 45 3300 80 6800 115 50 11 950 46 3400 81 6900 116 55 12 1000 47 3500 82 7000 117 60 13 1050 48 3600 83 7100 118 65 14 1100 49 3700 84 7200 119 70 15 1150 50 3800 85 7300 120 75 16 1200 51 3900 86 7400 121 80 17 1250 52 4000 87 7500 122 85 18 1300 53 4100 88 7600 123 90 19 1350 54 4200 89 7700 124 95 20 1400 55 4300 90 7800 125 100 21 1450 56 4400 91 7900 126 125 22 1500 57 4500 92 8000 127 150 23 1550 58 4600 93 8100 128 175 24 1600 59 4700 94 8200 129 200 25 1650 60 4800 95 8300 130 225 26 1700 61 4900 96 8400 131 250 27 1750 62 5000 97 8500 132 275 28 1800 63 5100 98 8600 133 300 29 1850 64 5200 99 8700 134 325 30 1900 65 5300 100 8800 135 350 31 1950 66 5400 101 8900 136 375 32 2000 67 5500 102 9000 137 400 33 2100 68 5600 103     425 34 2200 69 5700 104     450 35 2300 70 5800 105