Returns the raw measured dual-fuel split per engine load: for every operational-data row within the selected period start_datetime toend_datetime (defaulting to the last 365 days) where both a fuel-oil(pilot) and a gas (main) fuel were in use, x = load (fraction of MCR) andy = the pilot fuel's share of total main engine fuel consumption (0-1).- start_datetime: ISO-8601 start of the period (default: 365 days ago).- end_datetime: ISO-8601 end of the period (default: now).This is the data behind a vessel's dual-fuel split tables; it is available before any split table has been configured.