The time it takes the airplane to return to its original flight path after it encounters a wind gust is nearly instantaneous. No human even with computerized assistance could react as quickly. Despite the differences in the angle of attack (as shown by the 3 similar slopes), a stable airplane upon encountering such minor turbulence will return to its original flight position. This will occur without the pilot having to take additional action. The test results you have just graphed demonstrate that this airplane is a stable airplane.

Wind tunnel tests never actually test for turbulence. A wind tunnel test is always performed statically. That means the aircraft is set in one position and air is blown by it. Data is recorded. The model is then set to a slightly different position and the test is repeated. A huge amount of data is gathered at each position. From these static wind tunnel tests the dynamic behavior (movements) of the model can be inferred from the data that's been gathered.