Please take latest revision R13 instead of R12.
Although I seem to remember that R12 was not very different, there used to be R11 (I think) that was tremendously different. It's better to take the last one R13.
regards, Jan Willem
Subject: RE: [LAStools] LiDAR Specifications
Hi Narsimha,
Have a look into: LAS SPECIFICATION VERSION 1.4 – R12 10 June 2012
Cheers
Susana Gonzalez
Forest Engineer, LiDAR Science