The file <TABLE>.TD contains only floating point values with the restriction that each line of <TABLE>.TD contains the same number of floating point values.
Two column format: Each line describes a point of the characteristic curve. The first number is the value of the input signal and the second number is the value of the output signal. The numbers of the first column must increase and may appear only once within the first column. Output values for those input values which cannot be found within the first column, are received by linear interpolation (or extrapolation respectively).
Three column format: This format is supported to allow direct usage of x-y Recorder generated characteristic curves. The first column is redundant and contains no information. The second column corresponds to the first column the of two column format and the third column corresponds to the second column of the two column format. By definition, the first value of the first column is one, and the following values of the first column are always zero.