The output of rcorrp.cens

[WenxiongLiao]

           Dxy               S.D. x1 more concordant x2 more concordant                  n 
 -2.330878e-01       6.581517e-02       3.821363e-01       6.152241e-01       7.240000e+02 
       missing         uncensored     Relevant Pairs          Uncertain               C X1 
  0.000000e+00       7.700000e+01       9.774000e+04       4.257100e+05       7.039390e-01 
          C X2             Dxy X1             Dxy X2 
  7.363515e-01       4.078780e-01       4.727031e-01 

What is the meaning of this output?
It seems the 'C X1' and 'C X2' are the c-index But I do not konw the meaning of 'Dxy' and ' S.D.' . Also, How can I get p-value from this output ?