% Echo Location Surface Spectrum in units of mm/sqrt(Hz) % 128 Frequency Bands are 0.00781250 Hz wide 280 133 131 106 137 84 103 71 55 83 116 191 281 377 723 625 688 561 683 508 468 308 246 229 182 199 211 115 141 158 85 105 113 125 100 79 56 67 69 73 61 46 66 35 29 45 52 58 30 50 46 42 42 50 25 39 27 30 55 51 35 24 33 41 29 50 43 53 51 42 61 56 32 31 24 47 41 33 42 20 38 20 25 32 42 39 32 9 32 18 25 24 -13 24 18 -9 28 25 14 -3 -16 33 20 21 -9 8 -9 16 18 -16 -21 -20 -24 -19 17 -10 -25 -10 14 -4 -22 -13 -17 16 10 -7 -15 -18