9.G:
No such option is available for RNP and that's the only difference.
For the avionics engineer the coding is different for an RF leg than a DME ARC.
This is significant to the crew in the respect that the crew has no idea where the center point of an RF leg is, unlike a DME ARC.
Another significant difference between RNP AR and all other forms of RNAV procedures is that, in accordance with the table FPO posted, an RNP AR IAP does not have to taper down as it progresses towards the runway. Segment widths can decrease, then increase, then decrease, except no segment can be of a lesser RNP value than the final segment, and the final segment cannot vary in width in a given IAP. Also, there is no secondary area obstacle protection, unlike all other instrument procedures.