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We briefly review a number of approaches to modelling the complex , temporally and spatially non-stationary covariance structure of the field measurements and use such a model as a basis for computing optimal grid-cell estimates . Exhibit I shows that the top 20 percent of producers generate a dollar 's worth of revenue before interest and depreciation on 67 cents . Results : Employees attend a safety training session ( toolbox talk ) on various pertinent subjects daily . In additional to these facilities , most of which are less than fifteen years old , there are about 220 apartments for staff and visitors on campus which generate a total of 40,000 sq . A vast agro-industrial complex whose foreign exchange revenues augment a depleted national exchequer , plantation enclaves are protected , in moments of rupture , by the military apparatus of local and national governments . In Ms Treviranus ' view it would be unnecessary to uniquely and manually generate a new format in respect of the suggested 1295 templates . To understand the inner forces that govern a nuclear weapon , a fusion power source , or , indeed , the interior of a star requires knowing how the thermonuclear process works .