<qa>  What is the dose of indacaterol?The study is designed to obtain safety and efficacy data on three dose levels of indacaterol when delivered via an SDDPI in patients with persistent asthma. All patients will receive 1 day of treatment with each of the following: indacaterol 150 μg, indacaterol 300 μg, indacaterol 600 μg, placebo, and formoterol. Each treatment day will be followed by a washout-period of 1 week 