Circuit Note CN-0396 resistor noise value

Hello everyone,

I have a question about the mentioned resistor noise in CN-0396 on page 4.

"The 12.4 kΩ resistors, R7 and R11, each contribute approximately 294 nV p-p over the 0.1 Hz to 10 Hz bandwidth."

This 294nVpp is used in the total noise calculation. How is this value calculated? I suppose that this value is from the Johnson noise, but I don't get 294nVpp...

Thanks for your help