What do the different state colors mean?

:  Explanation for the colors in the map can be found below the map in the key. Purple means that the state has no federal requirements for voting systems. Relevant state statutes and/or regulations make no mention of any federal agency, certification program, laboratory, or standard. Green means that the state requires that its voting systems be tested by a federally accredited laboratory. Relevant state statutes and/or regulations require testing by a federally or nationally accredited laboratory to federal standards. Orange means that the state requires testing its voting systems to federal standards. Relevant state statutes and/or rules require testing to federal voting system standards. (States reference standards drafted by the Federal Election Commission, National Institute of Standards and Technology, or the Election Assistance Commissioner). Blue means that the states require federal certification for its voting systems. Relevant state statutes and/or rules require that voting systems be certified by a federal agency.