What is the difference between grains.perimeter and grains.boundary.perimeter?

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Mustafa Rifat

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Jul 24, 2019, 3:18:15 PM7/24/19
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I have a grain (Id=1019). When I am giving this command: 
grains(1019).perimeter
it is showing me 108.7020
When I give grains(1019).boundary.perimeter it is showing me:
 (685,1)      10.4310
 (703,1)      23.0580
 (713,1)       1.0980
 (714,1)       1.0980
 (791,1)       1.0980
 (810,1)       2.1960
 (824,1)       1.0980
 (825,1)       2.1960
 (831,1)       2.1960
 (842,1)       2.1960
 (873,1)      15.3720
 (908,1)       1.0980
 (959,1)       0.5490
 (974,1)       1.0980
(1019,1)     117.4860
(1125,1)       9.8820
(1221,1)      20.3130
(1508,1)      22.5090

What does this mean? should not the grain parameter and the grain boundary parameter be same?
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