====== 21cmFAST ======
21cmFAST is a software that can simulate the large-scale distribution of intergalactic hydrogen in the universe at a given redshift.

===== - Brightness temperature =====

===== - Cubes =====

===== - Lightcones =====

===== - Spectra =====

===== - Power spectra =====

==== - Spherically averaged PS ====

==== - Cylindrically averaged PS  ====