Other scholars have raised several criticisms of this process. The connection between the layers at the archaeological sites and the conquest is uncertain. The narrow range of radiocarbon dates are cited with a less stringent confidence interval (68%) than the standard requirement of 95%, which would have produced a much wider range. The texts describing the relevant astronomical phenomena are extremely obscure. For example, the inscription on the Li "gui", a key text used in dating the conquest, can be interpreted in several different ways, with one alternative reading leading to the date of 9 January 1044 BC.