ficombine(1)

General options:

-h, --help

Gives general summary about the command line options.

--long-help, --help-long

Gives a detailed list of command line options.

--wiki-help, --help-wiki, --mediawiki-help, --help-mediawiki

Gives a detailed list of command line options in Mediawiki format.

--version, --version-short, --short-version

Gives some version information about the program.

-o, --output <fits>

The name of the output file (omitting or specifing '-' yields the output to be written to stdout).

--history, --no-history

Incude or exclude the command line of the invoking `ficombine` call. By default, the command line is added into the FITS headers (FI_HSTRY) but if there are enormous amount of input files, one can use --no-history to omit the respective lengthy keywords.

--data <spec>

Output pixel data format specification.

-b, --bitpix <bitpix>

Standard FITS output bitpix value.

-M, --input-mask <fits>

Input mask file to co-add to output image.

Generic combination specification:

-m, --mode <mode>

Use the specified mode to combine images.

-n, --ignore-negative

Ignore (i.e. mask) pixels with negative values.

--logical-or

Use logical "or" combination between masks.

--logical-and

Use logical "and" combination between masks.

Combination modes (a comma-separated list of these should follow -m|--mode):

mean

The mean value of the pixels.

median

The median value of the pixels.

min, minimum

The minimum value of the pixels.

max, maximum

The maximum value of the pixels.

rejmed, rejection

Median value after rejecting outliers.

rejmean

Mean value after rejecting outliers.

iterations=<n>

Number of iterations to reject outliers.

lower=<l>, upper=<u>, sigma=<s>

Outlier limit (lower, upper, both) in standard deviation. Note that setting sigma to some value is equivalent to setting 'lower' and 'upper' to the same value simultaneously.

truncated

Truncated mean.

winsorized

Winsorized mean.

lowest=<cnt>, highest=<cnt>, discard=<cnt>

Reject the 'lowest' and 'highest' count of points when computing truncated or winsorized mean. Setting 'discard' to some value is equivalent to setting 'lowest' and 'highest' to this value simultaneously.

sum

Sum of the pixel values.

squaresum

Sum for the squarers of the pixel values.

scatter, stddev

Pixel scatter (standard deviation).

or

Use logical "or" combination between masks.

and

Use logical "and" combination between masks.

ignorenegative

Ignore (i.e. mask) pixels with negative values.

ignorezero

Ignore (i.e. mask) pixels with a zero value.

ignorenegative

Ignore (i.e. mask) pixels with positive values.