How high was tsunami caused by 2018's Krakatoa volcanic eruption?

A new study has claimed that the Anak Krakatoa volcanic eruption of December 2018 unleashed a wave at least 100-metre high that could have caused widespread devastation had it been travelling in another direction. Krakatoa erupted and partially collapsed into the sea, sending a wave westward towards Indonesia's Sumatra that was over 5 metres high when it made landfall.