2 Input file

• Standard input: in the original versions of fresco up to frxp.18 (1997) fresco uses input files in formatted fortran style.Then, each line obeys a strict format, in which a certain number of columns are reserved for each variable. Fresco can be downloaded from: http://www.fresco.org.uk
• Namelist input: since version frxx, FRESCO allows input files in fortran namelist style, in which each variable is specified in the format variable=value. Thus, the strict formatted style in no longer used in this version. However, to allow backward compatibility, a tool is provided to convert from old style to new style.
• Graphical input: the enormous number of variables accepted by FRESCO makes sometimes input files difficult to edit or to interpret, specially to the occasional fresco user. In order to make easier the edition of input files, the graphical front-end XFRESCO [2] can be used. In this interface the variables are organized in a logical way, according to the physics that they describe and a short text description is supplied for most variables. The program is distributed for free, under the GNU license, and can be downloaded from: http://personal.us.es/moro/xfresco/index.html