/ _____\ / _____ _____\ / _____ _____\ / _____ _____ \ / _____ _____ \ / _____ _____ \ / _____ _____ \ / _____ _____ \ / _____ _____ \ | 2/3 / -1 | | 2/3 / -1 2/3 6 ___ / -1 | | 2/3 / -1 2/3 6 ___ / -1 | | 2/3 / -1 /pi\ 2/3 / -1 /pi\| | 2/3 / -1 /pi\ 2/3 / -1 /pi\| | 2/3 / -1 /2*pi\ 2/3 / -1 /2*pi\| | 2/3 / -1 /2*pi\ 2/3 / -1 /2*pi\| | 2/3 / -1 /4*pi\ 2/3 / -1 /4*pi\| | 2/3 / -1 /4*pi\ 2/3 / -1 /4*pi\| | 6 * / --- | | 6 * / --- I*2 *\/ 3 * / --- | | 6 * / --- I*2 *\/ 3 * / --- | | 6 * / --- *cos|--| I*6 * / --- *sin|--|| | 6 * / --- *cos|--| I*6 * / --- *sin|--|| | 6 * / --- *cos|----| I*6 * / --- *sin|----|| | 6 * / --- *cos|----| I*6 * / --- *sin|----|| | 6 * / --- *cos|----| I*6 * / --- *sin|----|| | 6 * / --- *cos|----| I*6 * / --- *sin|----|| | 9 / 15 | | 9 / 15 9 / 15 | | 9 / 15 9 / 15 | | 9 / 15 \9 / 9 / 15 \9 /| | 9 / 15 \9 / 9 / 15 \9 /| | 9 / 15 \ 9 / 9 / 15 \ 9 /| | 9 / 15 \ 9 / 9 / 15 \ 9 /| | 9 / 15 \ 9 / 9 / 15 \ 9 /| | 9 / 15 \ 9 / 9 / 15 \ 9 /| | \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | | \/ b \/ b | |a - ---------------|*|a + --------------- + -----------------------|*|a + --------------- - -----------------------|*|a + ----------------------- + -------------------------|*|a + ----------------------- - -------------------------|*|a + - ------------------------- + ---------------------------|*|a + - ------------------------- - ---------------------------|*|a + - ------------------------- + ---------------------------|*|a + - ------------------------- - ---------------------------| \ 6 / \ 12 4 / \ 12 4 / \ 6 6 / \ 6 6 / \ 6 6 / \ 6 6 / \ 6 6 / \ 6 6 /