EXP_RATE_MEDIUM_FAST
EXP_RATE_ERRATIC
EXP_RATE_FLUCTUATING
EXP_RATE_MEDIUM_SLOW
EXP_RATE_FAST
EXP_RATE_SLOW
EXP_RATE_6_UNUSED
EXP_RATE_7_UNUSED
EXP_RATE_COUNT
