Composition-adjusted price & rent index — 100 = the 2026-08-01 baseline level. Each point is a 30-day trailing median (hundreds of listings, so it's smooth — not the 3–4 that list on a single day), with the model removing the effect of which flats happen to list, so it tracks real price movement, not the mix. Faint line = raw median €/m² (composition-biased) for comparison. Only ~4 weeks of data so far — it stays near 100 until the market has time to move; it fills one point per day.