An MBC data structure is a structure array that contains these fields:
varNames — Cell array of character vectors that hold the names of the variables in the data (1xn or nx1).
varUnits — Cell array of character vectors that hold the units associated with the variables in varNames (1xn or nx1). If array is empty, no units are defined.
data — Array that holds the values of the variables (mxn).
comment — Optional character vector holding comment information about the data.
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