speckletool_X.Y.Z_source.tar.gz
    This file represents the version X.Y.Z of speckletool source code, It is in 
    the format (tar.gz) that Gnu-Linux uses to compress source files.


speckletool_X.Y.Z_source.tar.gz.sig
    This file only is necesary to verify the the author authenticity of the file
    speckletool_X.Y.Z_source.tar.gz.
    This file is GPG binary signature of the file speckletool_X.Y.Z_source.tar.gz, to 
    verify it you can use the next command: 
    gpg --verify speckletool_X.Y.Z_source.tar.gz