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7 Command file: Specifying variance structures 118R structure definitionFor each of the s sections there must be c R structure definitions. Each definitionmay take several lines. Each R structure definition specifies a variance model andhas the formorder [field model [initial values] [qualifiers][additional initial values]]• order is either the number of levels in thecorresponding term or the name of a factorthat has the same number of levels as theterm, for example,11 column AR1 0.5is equivalent tocolumn column AR1 0.5when column is a factor with 11 levels,NIN Alliance Trial 1989variety !A.row 22column 11nin89aug.asd !skip 1yield ∼ mu variety !r repl,!f mv1 2 111 column AR1 0.322 row AR1 0.3repl 1repl 0 IDV 0.1• field is the name of the data field (variate or factor) that corresponds to theterm and therefore indexes the levels of the term;– ASReml uses this field to sort the units so they match the R structure,– in the example the data will be sorted internally rows within columns forthe analysis but the residuals will be printed in the .yht file in the originalorder (which is actually rows within columns in this case).Important It is assumed that the joint indexing of the components uniquelydefines the experimental units,– if field is a variable, it can be plot coordinates provided the plots are in aregular grid. Thus in this example11 lat AR1 0.322 long AR1 0.3is valid because lat gives column position and long gives row position, andthe positions are on a regular grid. The autoregressive correlation values willstill be on an plot index basis (1, 2, 3, . . . ), not on a distance basis (10m,20m, 30m, . . . ),– if the data is sorted appropriately for the order the models are specified, setfield to 0,