eta_M3A00.dat consist of a matrix 11520x49
"kA = 0.13 (A = 0.069 m, Tp = 1.44 s); incident wave angle = 0 deg"
"kA = 0.18 (A = 0.091 m, Tp = 1.44 s); incident wave angle = 0 deg"
"eta0, eta90, eta180 & eta270 are the measured water elevations for the tests with the focused wave groups generated from the same wave amplitude components but with the phase of each Fourier component shifted 0 deg, 90 deg, 180 deg and 270 deg respectively."
The order of the columns: 
Column 1 = time history in second
Column 2 to 5: eta measured without models at location WG7 for kA = 0.13
Column 6 to 9: eta measured with Model 3 at location WG7 for kA = 0.13
Column 10 to 13: eta measured without models at location WG10 for kA = 0.13
Column 14 to 17: eta measured with Model 3 at location WG10 for kA = 0.13
Column 18 to 21: eta measured without models at location WG22 for kA = 0.13
Column 22 to 25: eta measured with Model 3 at location WG22 for kA = 0.13
Column 26 to 29: eta measured without models at location WG7 for kA = 0.18
Column 30 to 33: eta measured with Model 3 at location WG7 for kA = 0.18
Column 34 to 37: eta measured without models at location WG10 for kA = 0.18
Column 38 to 41: eta measured with Model 3 at location WG10 for kA = 0.18
Column 42 to 45: eta measured without models at location WG22 for kA = 0.18
Column 46 to 49: eta measured with Model 3 at location WG22 for kA = 0.18