If your query refers to technical research rather than hardware:
: Recent studies, such as the Psycholinguistic Tripartite Graph Network (Paper 326 in the ACL Anthology), use "deep text" analysis (deep neural networks) to detect personality traits from online posts. 326 mp4
: These devices natively play .mp4 , .m4v , and .mov files. If your query refers to technical research rather
: Apple provides "deep" documentation on iPhone 5c and iPhone 4 specs, covering everything from the 326 ppi display to MP4 playback limits. 326 mp4
The number is the signature pixel density (PPI) for Apple's original Retina Display .
: For older 326 ppi devices (like iPhone 5c), the standard was H.264 video up to 1080p at 30 frames per second .