Что означают значения столбцов статистики в ps?

В столбце СТАТИСТИКИ ps есть куча букв, которые на самом деле не имеют особого смысла. Что они означают?

Вот пример того, как ps aux | head:

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMANDroot         1  0.0  0.0  27176  2960 ?        Ss   Sep20   0:02 /sbin/initroot         2  0.0  0.0      0     0 ?        S    Sep20   0:00 [kthreadd]root         3  0.0  0.0      0     0 ?        S    Sep20  13:05 [ksoftirqd/0]root         5  0.0  0.0      0     0 ?        S<   Sep20   0:00 [kworker/0:0H]root         7  0.0  0.0      0     0 ?        S<   Sep20   0:00 [kworker/u:0H]root         8  0.0  0.0      0     0 ?        S    Sep20   2:16 [migration/0]root         9  0.0  0.0      0     0 ?        S    Sep20   0:00 [rcu_bh]root        10  0.0  0.0      0     0 ?        S    Sep20  20:08 [rcu_sched]root        11  0.0  0.0      0     0 ?        S    Sep20   0:07 [watchdog/0]root        12  0.0  0.0      0     0 ?        S    Sep20   0:05 [watchdog/1]root        13  0.0  0.0      0     0 ?        S    Sep20   2:21 [ksoftirqd/1]root        14  0.0  0.0      0     0 ?        S    Sep20   1:00 [migration/1]

man ps содержит все ответы в разделе "КОДЫ СОСТОЯНИЙ ПРОЦЕССА".:

PROCESS STATE CODES       Here are the different values that the s, stat and state output specifiers (header "STAT" or "S") will display to describe the state of a process:       D    uninterruptible sleep (usually IO)       R    running or runnable (on run queue)       S    interruptible sleep (waiting for an event to complete)       T    stopped, either by a job control signal or because it is being traced.       W    paging (not valid since the 2.6.xx kernel)       X    dead (should never be seen)       Z    defunct ("zombie") process, terminated but not reaped by its parent.       For BSD formats and when the stat keyword is used, additional characters may be displayed:       <    high-priority (not nice to other users)       N    low-priority (nice to other users)       L    has pages locked into memory (for real-time and custom IO)       s    is a session leader       l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)       +    is in the foreground process group.