In ripples, the coarsest materials collect at the crests causing inverse grading. L filters have the coarsest pore size while L have the finest. It is the coarsest topology on for which all evaluation maps , are continuous. This distinguishes small ripples from dunes, where the coarsest materials are generally in the troughs. The coarsest grade of Inca cloth was called chusi. Several grades were produced from the coarsest lockram to the finest sasheen. Forged parts have the coarsest eutectic masses and so take the longest times. The application of water, applied by a sponge or soft cloth, removed the coarsest dirt. Preforms may use less time with the coarsest step, or skip it altogether.