[Pre-BB] MapleStory Formula Compilation

QUESTION: How is the heal rate for healing oneself and others calculated for clerics?

HYPOTHESIS: Heal rate is calculated through a special formula based on MATK and INT.

TESTING PROCEDURE:
1. Created a Cleric at level 30 on a PServer
2. Placed one point in Heal.
3. Forced my current HP to be 1 and my max HP to be 30000.
4. Set my INT and MATK to 0
5. Used heal without any undead monsters by me.

RESULT: My HP recovered by exactly 3000 HP

6. Increased INT to 300
7. Created a staff and gave it -300 MATK, so my current stats were INT = 300 and MATK = 0.
8. Forced my current HP to be 1 and my max HP to be 30000
9. Healed myself with no undead present.

RESULT: My HP recovered by exactly 3000

10. Removed the MATK reduction on my staff, so my stats were INT = 300, MATK = 300
11. Forced my current HP to be 1 and my max HP to be 30000
12. Used Heal with no undead present.

RESULT: My HP recovered by exactly 3000

13. Summoned a Zombie Mushroom.
14. Set my current HP to 1 and my max HP to 30,000
15. Attacked the Zombie Mushroom with heal

RESULT: My HP recovered by exactly 3000 and I dealt damage to the zombie mushroom

Conclusion: My hypothesis is wrong. Heal is calculated using the actual percentage in the skill description, and is completely separate from attacking mobs.