Document density-fit cross-correlation in .mdp options

Add missing documentation about cross-correlation as
similarity measure for density-guided simulations.

Though documented in the reference manual, it was until now
not mentioned in the .mdp options.

Change-Id: I2a5a13ca6fb0a15e8c2ff1cba6a6edbe0182053d

diff --git a/docs/user-guide/mdp-options.rst b/docs/user-guide/mdp-options.rst
index f44286dbfb1fcdc9e1acf0a544d71cbd4708faf9..d68588f6cfb8a266175f6b7401ee53e4061ebd69 100644 (file)
--- a/docs/user-guide/mdp-options.rst
+++ b/docs/user-guide/mdp-options.rst
@@ -3240,6 +3240,11 @@ electron-microscopy experiments. (See the `reference manual`_ for details)
       between reference density and simulated density as similarity measure.
       Negative density values are ignored.
 
+   .. mdp-value:: cross-correlation
+
+      Uses the Pearson correlation coefficient between reference density and
+      simulated density as similarity measure.
+
 .. mdp:: density-guided-simulation-atom-spreading-weight
 
    (unity) Determines the multiplication factor for the Gaussian kernel when