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Use -Dg to get mGal from m] -E Estimate spEctrum of r [x] [y]. Write f, power[f], 1 std dev(power[f]) to stdout. Append w to write wavelength instead of frequency. -F Filter r [x] [y] freq according to four wavelengths ///. freq outside / are cut; inside / are passed, rest are tapered. replace wavelength by - to skip, e.g. -F-/-/500/100 is a low-pass filter. -I Integrate, i.e., devide by kr [ * scale]. Use -Ig to get m from mGal] -L Leave trend alone. Do not remove least squares plane from data. [Default removes plane]. -M Map units used. Convert grid dimensions from degrees to meters. -N Choose or inquire about suitable grid dimensions for FFT. -Nf will force the FFT to use the dimensions of the data. -Nq will inQuire about more suitable dimensions. -N/ will do FFT on array size / (Must be >= grdfile size). Default chooses dimensions >= data which optimize speed, accuracy of FFT. If FFT dimensions > grdfile dimensions, data are extended and tapered to zero. -S multiply field by scale after inverse FFT [1.0] Give -Sd to convert deflection of vertical to micro-radians -T Compute isostatic response. Input file is topo load. Append elastic thickness, and densities of load, mantle, water, and infill, all in SI units It also implicitly sets -L List operations in the order desired for execution. %s: GMT SYNTAX ERROR: Must specify at least one operation %s: GMT SYNTAX ERROR -N option: nx2 and/or ny2 <= 0 %s: GMT SYNTAX ERROR -S option: scale must be nonzero %s: GMT SYNTAX ERROR: Must specify input file %s: GMT SYNTAX ERROR -E option: -G ignored (stdout used for ASCII output) %s: GMT SYNTAX ERROR -G option: Must specify output file %s: Fatal GMT_memory error. 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