#0) More information on formula syntax:  http://doc.itk.ericsson.se/binder/current/html/ItkViewGuide/07_FormulaFiles.html
#1) Any text starting with a '#' is treated as a comment and discarded
#2) Each formula is split into the formula result variable name (part before the '=' sign) and the formula expression (the part after the '=' sign).
#3) Any reference in the formula expression to a counter name of other formula name is replaced by a perl variable reference
#4) The special names sum_<countername>, sum_time_<countername> and sum_mo_<countername> are replaced by a perl reference to variable containing counter aggregates
#5) Each formula expression is then evaluated using perl 'eval'. This means that the syntax of the expressions is the same as that of perl - you can use any perl operators & functions.
#6) The order in which the formulas are defined does not have any importance, a formula can refer to other formulas defined further down in the file
#7) The formula names should not start with "pm"

#Availability
Av_CellAvail = 100 * ( 900 - ( pmCellDowntime + pmCellDowntimeCellLocked ) ) / (900)
Av_CellDownMan = 100 * pmCellDowntimeCellLocked / 900
Av_CellDownAuto = 100 * pmCellDowntime / 900

