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License: GNU General Public License v3.0
fg_rm is the set of tools used in ADD REFERENCE to study the efficiency of three different blind foreground cleaning methods for HI intensity mapping. fg_rm is written in C and C++. 1 Installation. a) Modify the appropriate fields in the Makefile, in particular the paths to the dependencies' headers and libraries b) typing 'make' should do the trick 2 Dependencies. fg_rm uses several external libraries, which need to be installed before compiling it: a) GSL - GNU Scientific Library (version >= 1.16) b) FFTW - Fastest Fourier Transform of the West (version >= 3.3.3) c) HEALPix's C library (version >=3.11) d) libsharp - Library for spherical harmonic transforms e) CFITSIO f) IT++ (version >= 4.2) 3 Usage. To run fg_rm just type $ ./fg_rm <param filename> where <param filename> is the path to a parameter file controling the behaviour of fg_rm. The public version of the code comes with a sample param file (param.ini). The comments included in it are fairly explanatory. 4 Output. Depending on the parameters used to run fg_rm it will generate four different types of files: a) Foreground-cleaned maps: a set of HEALPix files containing a the cleaned temperature maps. b) Angular power spectra: a file containing 4 columns in this order: 1- Multipole number l 2- Angular power spectrum of the foreground-cleaned map 3- Angular power spectrum of the foreground-free map 4- Angular power spectrum of the cleaning residuals c) Radial power spectra: a file containing 4 columns in this order: 1- Radial wave number k_parallel 2- Radial power spectrum of the foreground-cleaned map 3- Radial power spectrum of the foreground-free map 4- Radial power spectrum of the cleaning residuals d) Principal eigenvalues (only for PCA). For the file types a-c, one file will be written for each input map. Both the input and output files should have a suffix _XXX where XXX is a 3-digit integer number identifying each frequency band. This format is automatically used by the public code CRIME (http://intensitymapping.physics.ox.ac.uk/CRIME.html). 5 License. fg_rm is distributed under the GPL license (see COPYING in the root directory). We kindly ask you to cite the program's website "http://intensitymapping.physics.ox.ac.uk/Software" and accompanying paper TODO when using it for published results
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