suppose i want so select ARG 188 and TRP 144 and also want to see the 
distance between them ....how i do this in chimera..please help me.<br clear="all"><font color="#888888"><br>-- <br><span style="font-family:courier new,monospace;color:rgb(51,51,51)">BISHWAJIT DAS<br>
KOLKATA,West Bengal<br>INDIA</span><b style="font-family:courier new,monospace"><span style="color:rgb(102,51,0)"><br></span></b></font><br clear="all"><br>-- <br><span style="font-family:courier new,monospace;color:rgb(51,51,51)"></span><br>