instruction: Given the reference text below the eruption of Mount Vesuvius, how high was the mountain after the disaster?
context: In December 1631, Mount Vesuvius in Italy erupted. The eruption began on 16 December 1631 and culminated the day after. The Volcanic Explosivity Index was VEI-5, and it was a Plinian eruption that buried many villages under the resulting lava flows. It is estimated that between 4,000 people were killed by the eruption, making it the highest death toll for a volcanic disaster in the Mediterranean in the last 1800 years.[citation needed] The 1631 eruption was considered to be of minor proportions regarding its eruptive magnitude and erupted volumes compared to the AD 79 eruption, but the damage was not.[citation needed] By the 1631 eruption, the summit of Mount Vesuvius had been reduced by 450m, making its total height lower than that of Mount Somma.
response: Mount Vesuvius had a reduced summit by 450 meters.