The main point of this file is to provide ratios of intensities for
various CHEMS and INCA channels. It covers the time range 2004:001
to 2015:031 and has hourly averages of:
CHEMS W+ to H+
CHEMS H2+ to H+
CHEMS He++ to H+
INCA O+ to H+

The CHEMS ratios are provided over different energy ranges. Each of the above
CHEMS combinations has one ratio created by summing channels from 32 to 220 keV.
There are also some ratios with a more limited energy range. The CHEMS W+ to H+
has one ratio with just the low energies (9 to 14 keV), and one over its full
energy range (9 to 220 keV). The CHEMS H2+ and He++ ratios also have values
created by summing channels over the range 32 to 48 keV.

For each ratio provided, the value that went into the numerator and
the value that went into the denominator are also represented by separate
columns in the file.

For INCA, the O+ to H+ ratios are provided for the following energy ranges:
50 to 90 keV
90 to 140 keV
50 to 190 keV
The last of these is designed to be close to the widest energy range
of the CHEMS W+ to H+ ratio (which was 32 to 220 keV) so that these
ratios can be roughly compared.

Finally, there are columns with values from individual channels. Any CHEMS
or INCA channel that was used in any of the ratios is present in its own
column in the data file.

There are prefix columns that provide context for each data line. The prefix columsn are:

Year
DayOfYear
Hour
Min
Sec
FracYr - the date as a single number: year plus fractional year
Rs - distance from Cassini to (the center of) Saturn in Saturn radii
Lat_SZS - degress latitiude in the SZS frame
X_SZS - the X position in the SZS frame in Saturn radii
Y_SZS - the Y position in the SZS frame in Saturn radii
Z_SZS - the Z position in the SZS frame in Saturn radii


A brief description of some of the ratios is provided here.
Others are similar, but with different energy ranges:

CHEMS_W+_to_H+_9_to_14_keV
A ratio of CHEMS W+ to H+ over a limited energy range (9 to 14 keV).
The W+ channels are the so-called "BEST" combination of doubles + triples.
In other words, the combination switches to triples only above a certain energy.
The H+ value is also created using the "BEST" channels.

CHEMS_W+_9_to_14keV - the numerator of the above ratio
CHEMS_H+_9_to_14keV - the denominator of the above ratio

CHEMS_W+_to_H+_9_to_220_keV
A ratio of CHEMS W+ to H+ over the widest possible energy range (9 to 220 keV).
The W+ channels are the so-called "BEST" combination of doubles + triples.
In other words, the combination switches to triples only above a certain energy.
The H+ value is also created using the "BEST" channels.

CHEMS_W+_9_to_220keV - the numerator of the above ratio
CHEMS_H+_9_to_220keV - the denominator of the above ratio