"two.sided" or "one.sided".
True difference in means.
Description of the calculation.
Number of observations (per group, or of pairs).
OptionalnoteA note on the sample size.
Power of the test.
Standard deviation.
Significance level (R's sig.level).
R's warnings, each once, in R's order (an empty array when there are none).
Result of powerTTest: R's power.htest with the solved quantity filled in.