per);
    const intervals = [];
    for (const expectation of model.userModel.expectations) {
      if (!(expectation instanceof tr.model.um.LoadExpectation)) continue;
      if (tr.e.chrome.CHROME_INTERNAL_URLS.includes(
          expectation.url)) {
        continue;
      }
      if (expectation.timeToInteractive !== undefined) {
        intervals.push(tr.b.math.Range.fromExplicitRange(
            expectation.navigationStart.start, expectation.timeToInteractive));
      }
    }
    return intervals.sort