Viewing large sets of data is many times painfull. This problem is worst whenever you have a table with a header and when you scroll down you loose sight of it. Now, whenever you embed a Junar data stream you can freeze as many rows as you want so viewing them it's a breeze. For example, here we have a data stream that's particularly long (...most common men names in the US) and lets say I want to embed it on my blog but keep the first row frozen, so Name, % Frecuency, Aprox Number and Rank can be fixed on top and don't move as users scroll down the data.

Now if you are on a data stream details (viewing a single data stream) you can click ACTIONS>EMBED and now you'll have a new field called Freeze that allows you to set how many rows you want to stay frozen (fixed)

Finally the data stream is now embedded and if you scroll down the first row (now in grey) will remain fixed for your viewing comfort.