Size effect in parametric paired t-test

Hi folks!
my question is that after calculation of " t-test paired [-200ms,500ms]: Rare vs. Frequent (100 participant) If I want to answer this question:
mentioning the effect size or the specific values of statistical significance (p-values) would strengthen the credibility and preciseness of the results reported.
how could I save it in csv the t-test paired result and save the P-values too?
Is there any possibility to check the effect size for a data with 2 ms resolution, in the brainstorm software?
I would thanks your idea sharing!