Crosspower file format

The X_file is an ASCII file containing the results of auto-power and crosspower spectral density
calculations. These so-called crosspower results are calculated from time-series data stored in file Y_file
with the same root name and extension. The crosspower file is 19 columns wide and each column is 11
characters long. For example:

6.250e+000 2.930e+000 2.100e+001 5.204e+007-1.727e+009 3.523e+006     
7. 500+000 2.930e+000 0.000e+000 0.000e+000 0.000e+000 0.0000e+000      
.
.


The data on each line correspond to a single frequency, and the units for the crosspower values are
geophysical: H in Gamma; F in mV/km. The data values are listed by column number in table below.

Columns 1- 3	Columns 4 - 7	Columns 8 - 11	Columns 12 - 15	Columns 16 - 19
Freq (Hz)	CH1*CHI		re(CH2*CH1)	re(CH3*CH1)	re(CH4*CHI)
bandwidth (Hz)	im(CH1*CH2)	CH2*CH2		re(CH3 *CH2)	re(CH4*CH2)
# of averages	im(CH1*CH3)	im(CH2*CH3)	CH3*CH3		re(CH4*CH3)
		im(CH1*CH4)	im(CH2*CH4)	im(CH3*CH4)	CH4*CH4


For frequencies where no crosspowers are available, '# of averages' value is 0.