A casual query before posting this as a question : What tapers are available in spectrum : default in modified.daniell. Are hanning and parzen windows available ?

I don't understand your question, @Anusha. Are you asking about options for a command in some software? If so, the question would be off-topic for CV. It might be on-topic on Stack Overflow. If you do ask on one of the SE sites, you should provide some context & spell out your terms.