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What is the difference between RG4 and R as it relates to orderable device part numbers?

Other Parts Discussed in Thread: MSP430F1491

I see the following orderable devices for the MSP430F1491 in PM package:

MSP430F1491IPM
MSP430F1491IPMG4
MSP430F1491IPMR
MSP430F1491IPMRG4

What is the difference between each?  Here's what I can tell from the data sheet:

(blank suffix), quantity 160
G4 suffix, quantity 160
R suffix, quantity 1000
RG4 suffix, quantity 1000

What is the difference between a blank suffx and a G4 suffix?  What is the difference between a R suffix and a RG4 suffix?

Does the R indicate the reel size and not necessarily the quantity since this would be package size dependent?  For example only quantity 1000 of the MSP430F1491 in PM package will fit on a reel whereas 2500 of the MSP430F1491 in RTD package will fit on the same sized reel?

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