Here’s how to get the same results from .meas statements as the automatically calculated integral noises:
.meas integrated param sqrt(tmp):
0 1.28748e-05
1 1.82077e-05
Which is the same that the simulator prints on the console:
1 of 2 steps: .step r=1000
Total integrated output-referenced noise: 12.8748µV rms
Total integrated input-referenced noise: 12.8748µV rms
2 of 2 steps: .step r=2000
Total integrated output-referenced noise: 18.2077µV rms
Total integrated input-referenced noise: 18.2077µV rms