Configuration parameters

Table summarizes the configuration parameters available for the model components used by the DIMM (see also detailed comments in appendix ). The default values are shown in the third column.

Table: Default parameters for the DIMM configuration file

Parameter	Definition	Default Value
(keyword)
	General Options
numiter	Either give a positive number that equals the number of	5
	iterations, or give a negative number that equals the maximum
	number of iterations using chi squared ($\chi^2$) stopping criterion.
chitol	$\chi^2$ tolerance, requires $NOI$ model component. If the $\chi^2$	$10^{-6}$
	difference $<1\times10^{-6}$, then make the current iteration the
	last iteration.
varmapmethod	Method of estimating variance map. If equal to zero, then use the	1
	spread of values from the time-series (i.e. the raw data). If equal
	to 1, then it samples the variance of data that land in each output
	map pixel.
maxlen	If performing the iterations in memory, this is the maximum	0
	length (seconds) for concatenated data. If equal to zero, then
	attempt to concatenate entire continuous chunks.
modelorder	Order in which to calculate DIMM model components.	(com,gai,ext,
		ast,flt,noi)
exportndf	An option to export DIMM model components as NDF files. It	0 (do not
	exports one file per model component, per subarray. Use this	export as NDF
	option to view the values in these files. Can also	files)
	specify list of components using modelorder syntax
	Pre-processing Data Cleaning Options
pad	Pad beginning and end of each chunk of data with this many samples	1000
apod	Apodize data at start and end over this many samples	1000
zeropad	Chooses how to pad - with zeros (1) or with artificial data (0)	0
order	Remove baseline polynomial of this order (0 = remove mean)	0
badfrac	If this fraction (or greater) of samples are bad, ignore entire bolometer	0.05
flagstat	Ignore data while telescope moving slower than this (arcsec/sec)	2
dcthresh	S/N threshold for detecting DC steps	-
dcbox	Sample length for measuring noise for DC step finder	-
spikethresh	S/N threshold for detecting spikes	-
spikeiter	iterations for spike $\sigma$-clipper (0=until convergence)	0
filt_edgehigh,	Enter low- and high-pass frequency limits in hertz (Hz).	-
filt_edgelow
filt_notchhigh,	Enter a range of high frequencies for filt_notchhigh and a range	-
filt_notchlow	of low frequencies for filt_notchlow to apply notch filters.
	Control Model Component Calculation
com.niter	Number of clipping iterations to use when finding common mode values	1
com.nsigma	Number of standard deviations at which to clip when finding common mode values	3
noi.spikethresh	Additional despiking after each iteration, within the $NOI$	10
	calculation.
noi.spikeiter	Additional despiking after each iteration, within the $NOI$	0
	calculation.
flt.filt_edgehigh,	Iterative filtering using $FLT$ model (see flt_* above).	0.2
flt.filt_edgelow		20
flt.filt_notchhigh,		-
flt.filt_notchlow		-
ext.tausrc	Source of opacity data: water vapour monitor (WVMRAW),	WVMRAW
	$\tau_\mathrm{CSO}$ (CSOTAU), or explicit value for filter (FILTERTAU).
ext.taumethod	Airmass calculation: full (separate value for each detector each	ADAPTIVE
	timeslice), quick (single airmass all detectors each timeslice), or
	adaptive (decide dynamically to use full or quick).
ext.csotau	Value of zenith $\tau_\mathrm{CSO}$ if ext.tausrc=CSOTAU.	-
ext.filtertau	Value of zenith optical depth for filter if ext.tausrc=FILTERTAU	-