Source data must be in columns as: [ID] [X] [Y] (each object in a separate row, column separator can be space, tab or semicolon, decimal separator can be either point or comma). Lines beginning with a character (field names) are excluded. If the last dimension has different units and meaning than X and Y (e.g. means date and time) then it must contain floating point numbers representing days from the beginning of year 1900 (Serial Date format used in Excel).