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2 1 RequirementsMicrosoft Windows Operation systems, for instance, this compiler is accessiblefrom the Command Window, found under Start/All programs/Accessories. Thecompiler is called by entering the command:g95 filename.f9 If free of errors, this produces an executable f le of standard name “a.exe”, that,once executed, does hopefully the tasks it was designed for. Consult the G95 usermanual (available from the above Web page) for more advanced compiler options.Enter “dir” in the Command Prompt window for a list of all subfolders and filecontained in a folder. Enter “cd name” to move to another subdirectory. Use “cd ..”to move back one level.1.3 Data-Visualisation SoftwareTo produce graphs and animations of model outputs, I can highly recommend theopen-source software SciLab that can be downloaded from:http://www.scilab.org/I have used Version 4.1 for Windows. This software is also available for GNU/Linux platforms. The good thing about this software is that it comes for free and thatits commands resemble those in MATLAB, being used by many scientists. SciLabalso comes with a text editor that the reader can use to write FORTRAN codes.Some of the SciLab commands used in the scripts of this book are obsolete in thenewest SciLab 5.x versions. Updated scripts can be requested from the author peremail.SciLab allows for export of graphics to several formats including POSTSCRIPTand GIF. The software suite ImageMagick, downloadable at:http://www.imagemagick.org/can be used to read, convert and write images in a variety of formats (about 100)including GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, and TIFF.ImageMagick can also be used to produce GIF animations that can be watched onmany internet browsers. An option is the open-source Firefox Web browser developedby MOZILLA found at:http://www.mozilla.org/1.4 Text EditorAny basic text editor such as Notepad or Wordpad will do for the writing ofFORTRAN programs. The open-source editor VIM can be downloaded at: