The CCP4 package (Version 3.5 ) is a suite of programs designed to aid the macromolecular crystallographer.

To start using the package add the following line to your .login or .cshrc file:

source /joule2/programs/ccp4/ccp4_v3.5/include/ccp4.setup 

Older versions can be accessed by executing:

source /joule2/programs/ccp4212/include/ccp4.setup 

There is an online manual at York (UK), also all the programs have write-ups; to access these writeups start with man pages of ccp4 (i.e. man ccp4).

Most of the programs have text documentation in:

/joule2/programs/ccp4/ccp4_v3.5/doc

The latest version of the density modification package (dm 1.6) written by Kevin Cowtan is in the CCP4 package, the executable is called dm1.6. The historgram library used by the program can be found in:

/joule2/programs/ccp4/src/dm1.6/hist.lib

Please check the dm 1.6 online manual.