finally, many height indications on these maps are from quite old measurements, while glacier and firn melt has decreased the height of both peaks and key cols, sometimes quite dramatically. for example, in 1930, glacier-capped cima tosa was the highest mountain of the brenta dolomites at 3,173 m, but now is around 3,140 m high and some 10 m lower than its rocky neighbor cima brenta (3,151 m). most maps and guides still report cima tosa's old height. on the other hand, in the 1930s, when the current italian 1:25.000 topographic map of the region was created, the "passo del vannino", northwest of the ofenhorn, was covered by the "lebendun" glacier and was measured to be 2,754 m, while the much more recent swisstopo map shows it to be bare and 2,717 m high. this is the key col for corno di ban (3,028 m), which, thanks to the retreat of the glacier, now appears on the list with a prominence of 311 m.