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What is the meaning of 10/350 of surge impulse current and 8/20 of surge maximum discharge current?

SPD’s surge impulses as per IEC61643 - 1

Type1
•Impulse discharge current (Iimp): maximal discharge current  for impulse wave 10/350mS, which SPD is capable of discharging 5 times.

    

 Type2
•Maximum discharge current (Imax): maximal discharge current  for impulse wave 8/20mS, which SPD can withstand at least 1 time.
 
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