Sort the Following Cellular Components to Reflect the Centrifugal Force

Short Answer

Sort the following cellular components to reflect the centrifugal force required to sediment them by preparative ultracentrifugation, from low to high force required. Your answer would be a four-letter string composed of letters R, M, L, and N, e.g. LRNM.
(L) Lysosomes
(M) Microsomes
(N) Nuclei
(R) Ribosomes (free cytosolic)