I've wondered that myself many times...Where are the values for each of these @s_t1_... stored?
Usually they are stored in the same file at the top. If you open for example _planetary_entities.asset you can find this at the top:
Code:
@astroid_scale = 30
I assume you know how it works but otherwise it's just a way to collectivize values to change many in the same file at the same time, so you can change it to a float value if you want.