What was the file size used in original expirements?

Stark, Michael and Boneh (2009) conducted experiments with SJCL against other libraries. When they measured throughput, what was the size of the plaintext object they put through the encryption?

I don't see it, I can only see in their paper the size of their codebase.

Wouldn't the plaintext file size matter in order to calculate the throughout?

If anyone knows, or I have misread, please do let me know.

For example :

File Size	Encryption Time	Throughput (MB/s)
1 MB	0.5 seconds	2 MB/s
10 MB	2 seconds	5 MB/s
100 MB	15 seconds	6.67 MB/s