Usage

% phenix.xtriage your_data.sca residues=290

  -  Matthews coefficient and Solvent content statistics

  -  space group determination

  -  twin detection

  -  anisotropic analysis

http://www.phenix-online.org/documentation/xtriage.htm#anch28

twin

when the twinned crystal consists of two domains. This type of twinning is know as hemihedral twinning. The twinning can be either merohedral (M; the twin related lattices overlap exactly) or pseudo-merohedral (PM; the twin related lattices overlap almost exactly). 

anisotropic diffraction 

http://www.doe-mbi.ucla.edu/~sawaya/anisoscale/  

http://www.pnas.org/cgi/content/full/103/21/8060