Save the history in Xively

Hello,

My project is to record the temperature and relative humidity of a room, send data to Xively.com and save it in a format . txt or .csv
For this, I have a card Arduino Uno, ethernet shield and sensors. I can send data to Xively and values ??of my sensors are displayed on my page in graph. Everything works perfectly!
Now I would like to easily save the history of temperature and relative humidity recorded. And I do not know how.

Is a user Xively can help me?
Thank you in advance!

What do you mean history?
Mark

Thanks for your help Mark.
For example, I have 2 datastreams "temperature" and "RH" and I wish saved every datapoint stored between 12h and 14h?

It's a HTTP command!
https://api.xively.com/v2/feeds/526059195.csv?start=2013-11-06T11:01:46Z&end=2013-11-06T13:01:46Z