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[CF-metadata] "threshold" variable in the coordinates attribute

From: John Caron <caron>
Date: Sun, 26 Feb 2012 15:59:29 -0700

in example 7.11:

variables:
   float n1(lat,lon);
     n1:standard_name="number_of_days_with_air_temperature_below_threshold";
     n1:coordinates="threshold time";
     n1:cell_methods="time: minimum within days time: sum over days";
   float n2(lat,lon);
     n2:standard_name="spell_length_of_days_with_air_temperature_below_threshold";
     n2:coordinates="threshold time";
     n2:cell_methods="time: minimum within days time: maximum over days";
   float threshold;
     threshold:standard_name="air_temperature";
     threshold:units="degC";
   double time;
     time:climatology="climatology_bounds";
     time:units="days since 2000-6-1";
   double climatology_bounds(time,nv);
data: // time coordinates translated to date/time format
   time="2008-1-16 6:00";
   climatology_bounds="2007-12-1 6:00", "2000-8-2 6:00";
   threshold=0.;


im somewhat surprised by seeing the "threshold" variable in the
coordinates attribute. I didnt see a discussion of this at

https://cf-pcmdi.llnl.gov/trac/ticket/33

can anyone explain what this means?
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