The following example illustrates another possible use of custom modulation to define a 
distorted constellation. In this particular case, a O-QPSK modulation with a quadrature 
error (non-perpendicular I and Q axis) is defined: 
 
#2 
Offset, yes 
iq 
1.05, 1.05 
-0.95, 0.95 
-1.05, -1.05 
0.95, -0.95 
 
The above file includes a line to indicate that this is an offset modulation. The resulting 
constellation after loading this file is shown as following: