〜に即して・〜に即した
in line with, based on (the facts / reality)
Noun (事実, 現状, 実態) + に即して / に即した + Noun
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に即して means "in close accordance with" facts or reality: 事実に即して、報告書を書いてください, "please write the report in line with the facts".
The noun is usually about reality: 事実, 現状 ("the current situation"), 実態 ("the actual state"), 実情. It can also be a rule, like 法律. Before a noun, it's に即した: 現状に即した対策, "measures suited to the current situation".
即 means "immediate, close to", so it's "sticking close to". It's formal and common in policy, reports and law.
It's close to に基づいて (N2) and に沿って (N2). Compare に反して (N2), "contrary to".
Examples
事実に即して、報告書を書いてください。
Please write the report in line with the facts.
現状に即した対策が必要だ。
We need measures suited to the current situation.
実態に即して、制度を見直すべきだ。
The system should be reviewed in line with what's actually happening.
法律に即して、厳正に処分する。
We will deal with it strictly in accordance with the law.
地域の実情に即した支援を行う。
We provide support tailored to local conditions.