The process should by now be clear. This process is tedious to do by hand and
for more than a simple calculation it is preferable to use a spreadsheet or program to
carry out the sum. An example spreadsheet should be available in the same location
that you found this document for example at the author’s website.
2
The spreadsheet
was created using the Openoffice.org “Calc” spreadsheet program version 1.1.5.
You can read this spreadsheet into a number of packages including LibreOffice
which can be obtained from the LibreOffice website.
3