They should both be 0.6/0.6.
AS missile damage is based on the 7 roll on the cluster chart. For 4, this is a 3, with 2 damage per SRM (and divided by 10 for AS). 0.6
Artemis adds to, so we assume a 9 roll. For 4, this is still a 3 and would still be 0.6 damage.
Artemis V adds 3 to the cluster chart, but also a -1 to-hit modifier. A 10 on the cluster chart is still 3 missiles, 0.6, but we add a 1.05 modifier to damage for the -1 to-hit. 0.63.
So the SRM 4 should be 0.6/0.6/0.63.
The rules for converting weapons to get the values is in SO. ASC starts with listing them already calculated, but that's where they come from.
Posting errata on the Clan SRM 4 for ASC.