Consumer prices excluding fresh food and energy, as a change over twelve months, as compiled by the Bank of Japan in its Indicators for Core CPI. It is the measure the Bank cites for underlying inflation, spliced across CPI base years.

Threshold source: Bank of Japan target 2 %; one point above is where the Bank has tightened. How thresholds are chosen

Published two business days after the official CPI, so about a month after the reference month. The splice across base years introduces small breaks at each rebasing.