Every tradeable Tomb of Amascut unique, indexed to its price at the start of the window.
Each line is rebased to 0% at its own price when the selected window starts (the dashed line) — not raw GP, since these items range from ~1m to ~1b+. A line at +50% means that item is 50% more expensive than it was at the start of the window; it says nothing about its price relative to any other item.
ToA's uniques only enter the game through raid completions, and the raid's invocation system means the effective drop rate per team varies with how hard players choose to run it — a shift in the community's average raid level can move supply even with no change to the game itself. Tumeken's shadow trades uncharged; the Masori pieces trade in their flawed "(f)" state, which is what the raid actually drops.
Every line is indexed to its own price at the start of the selected window rather than plotted in raw GP, so a Tumeken's shadow and a Masori chaps piece stay comparably visible on the same chart despite being tens of millions apart in price.
