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- The time between two local minima (lows) should be at least 2700 seconds or 45 minutes.
- Only the first last three lows before T0 and the first four lows after T0 are considered.
- The first two lows of the last three lows just before T0 are skipped, leaving only the third last one.
- Similarly the first two lows just after T0 are skipped, leaving the third and fourth ones.