Impedance file format The Z_file is an ASCII file containing the results of impedance calculations performed on the X and Y files bearing the same root file name and extension. The results are ordered by frequency and the values for each frequency occupy 2 lines with a total of 15 values per frequency. Each value is 11 characters long. An example of the format of data for a single frequency is: 11.2 0.5841 257 25.7 0.5052 168 43.5 153.379 34.161 11.034 -215.523 10.252 -129.447 -164.482 -86.834 The impedance variables are listed by column number in the table below. Column Line 1 Line 2 1 frequency in Hz re Zxx 2 ExHy coherency im Zxx 3 ExHy scalar apparent resistivity re Zxy 4 ExHy scalar phase im Zxy 5 EyHz coherency re Zyx 6 EyHx scalar apparent resistivity im Zyx 7 EyHx scalar phase re Zyy 8 im Zyy