Confusion on Syn Calculator

Hi, I am doing Slimming world online as I live in middle east but am having real problems with the syn calculator!

I am have a tuna salad for lunch at the mo with skimmed yoghurt (0% fat items are very hard to come by here!), so trying to syn out my yoghurt, if I click the button that says use free allowance, the yoghurt comes up as free, if I dont click that button then its 3.5 for the tub.

I just dont get it!

Details of the yoghurt per 100g are:

44 Kcal / 185 kj
Fat 0.5g
Protein 4.6g
Carb 6.3g
Pot size 170g

Is it free or not????

Any help greatly appreciated

thanks
 
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