data.aggregate.ccnfit generates fits for CCN vs SS. Fits are done across a scan (or half-scan) as defined by ccnfit.conf.

Command Line Usage

data.aggregate.ccnfit [--source=clean] 
                      [--method=default] [--equation=default] 
                      station [record] start [end]


The record field is optional and if present it is used to filter the output, if omitted all available CCNs are fitted.

start and end

The time specifiers for the data to be retrieved. Start is inclusive while end is exclusive, so all data contained within the half open interval [start,end) will be returned. Any convertible time format is accepted.


The station identifier code. For example 'sgp'. Case insensitive.


Record code to output. Must be of the form “N11f” where the instrument type is one defined in the configuration file. If present only that record is output, if omitted all CCNs defined in the configuration file are fitted and output.


Select the source archive to request data from, defaulting to clean.


Select the fit method to use, see below. Defaulting to LevenbergMarquardt.


Select the equation to fit, see below. Defaulting to TwoParameter.

Fitting Methods






a + b * SS

Only for testing, does not give good fits on real data.

Example Usage

data.aggregate.ccnfit sgp 2009-02-10T21:00:00Z 2009-02-10T23:00:00Z