PoB: Trinity DPS calculation

Hi,

I'm currently using Trinity support with Lightning Strike and asking how to calculate the DPS in PoB.
PoB has the option to set 'lowest resonance count'. Any idea what a valid number is to calculate the DPS, or on what the lowest count is relying on?
While playing the three elemental parts of the Trinity symbol are completely filled.

Read the gem description.

You gain resonance for elements that are not your highest elemental damage type, and since for your build that happens for all damage types on a regular basis, you will have maxed resonance of all elements and your lowest resonance is 50.

I've read the 50 maximum resonance in the gem description, but was unsure about the lowest value that in this case also 50 counted, thanks for clarifying.

Can anybody write below the formula on the example how to calculate increased damage using Trinity for tornado shot - on some example build:
COLD DMG: 100-200
FIRE DMG: 150-250
LIGTHTING DMG: 50-300

Im still confused regarding "resonanse" - how exectly it works - I will apreciate some simple exmplaination on the example above.