Every process here drills to its own section of 1.1 Download FedInvest prices and calculate yields. The flow entering from the edge is the FedInvest daily price list, drawn against its source on the context diagram. 1.1.1 reads the date it states, and 1.1.2 reads its rows. On a Bond Holiday, or when the price list does not state prices for the run date, 1.1.1 produces no settlement date and FedInvest prices (S1) is not written. The amber circles are shared modules (SharedModules.md), not process steps of this diagram.