A 2006 article in Andes Magazine proposed that Ojos del Salado may be higher than Aconcagua, an argument premised on old altitude surveys of questionable accuracy which assigned Ojos del Salado an elevation of , nearly higher than Aconcagua. A 1955 estimate set the elevation of Ojos del Salado at , but that was "simply [...] based on the altitude of the final camp, and the hours of ascent to the summit." In 1956 the first Chilean expedition, led by the retired lieutenant René Gajardo, using a pocket pressure altimeter, measured the height of Ojos del Salado as . Compounding the inexact quality of this method is the fact that the measurement was taken when the team reached the summit in the afternoon, when air pressure generally decreases, which resulted in a reading far too high.