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The investigators recommended suggested that such an incident is relevant to the safety case being made at that time for the introduction of RVSM in Europe . The legal requirements and potential ramifications of such an action are simply too complex . Tangible proof of such an acknowledgement was to be the scrapping of the 1975 treaty and the restoration of Iraqi sovereignty over the whole of the Shatt al - ' Arab . A data transfer symbol appears within the bordered area during the data transfer operation to signify that such an operation is in progress . If such an assumption is true , it follows that a series of sites can be arranged so that all artifact types within them form single peaked curves of popularity over time .