Use controls to see different aspects of the sc2 ladder ranking history. Seasons are marked by the colored sections of the x-axis. Mouse over on points to see date, season and full information for that point. The rankings are all based on league and ladder points, not MMR.
There is no selection available between game versions. For each point in time the data is chosen based on availability. LotV data will be selected before HotS data, and HotS before WoL data. So for example if the team was ranked in a HotS ladder the HotS data will be shown. If there is no LotV or HotS data available but the team is ranked in a WoL ladder the WoL data will be shown. If a team has switched from WoL to HotS between seasons both HotS and WoL points will be shown in the graph (but only one for each point in time). Mouse over the graph to see game version for that point.