what tonnage affects the price of goods at a station?

Peculiar question, but I've noticed recently (as I get bored easily) when I dock at a station with no cargo the prices can be 5-6 credits higher than laden.

Being experimental I've found carrying smaller loads (ie 50 odd) of a range of similar goods garners more profit.

Now it's not (for my asp) a lot (3-4k a trip) but its intrigued me. Has anyone seen if these thresholds are linear or is there a "tier" system?

Cheers, Firebeard
 
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