SPECPR Users’ Manual Page 8-f39.1 F39: Random Number Noise Generator Alias = noise This routine uses the system random number generator to generate noise with a normal distribution and a standard deviation of 1.0. The user can then multiply the resulting numbers by a constant to generate noise with a different standard deviation, and the noise may be added to a spectrum. The routine generates a random number for each channel in use. The user then gives a scale factor to scale the noise to the desired interval. For example if you wanted noise of 3% (standard deviation of 0.03), you would scale the noise by 0.03.