Simulating 1D grid or signal data files means modifying their data values with values from the actual database loaded into oSP3D. Because oSP3D can write a valid CSV data file from beginning to end following the format specification given in CSV Files, oSP3D does not modify any given CSV file but rather always overwrites it.

For signal data, oSP3D overwrites the given CSV file with the former time stamp value and its usually simulated data value. You cannot modify the digit precision of real numbers determined by their machine precision.