Hello:
    I select a region and save it to a label file named red.label. But I could't understand the data in this file. The follwing is part of this file.

#!ascii label  , from subject cengqinping vox2ras=TkReg coords=white
5690
31281  -51.356  -54.196  26.649 0.000000
31282  -52.142  -54.229  26.699 0.000000
31283  -52.709  -54.040  26.704 0.000000
31284  -52.913  -53.821  26.712 0.000000
31313  -50.128  -54.270  25.875 0.000000
31314  -50.598  -54.363  26.022 0.000000
31315  -51.471  -54.354  26.035 0.000000
31316  -52.222  -54.125  26.099 0.000000

(1).Does the  number 31281 int the first row means the number of vertex?
(2).what does (-51.356  -54.196  26.649) mean?
(3),what does the zero at the end of row mean?
(4).I want to get the thickness of every vertex,  How can I do that?

thanks in advance
      Tim