The crux of the case hinges on an Aug. 7, 2018, tweet in which Musk declared “funding secured ” to take Tesla private. Musk abruptly posted the tweet minutes before boarding his private jet after being alerted that the Financial Times was about to publish a story that Saudi Arabia’s Public Investment Fund had spent about $2 billion buying a 5% stake in Tesla to diversify its interests beyond oil, according to his testimony.

Amid widespread confusion about whether Musk’s Twitter account had been hacked or he was joking, Musk followed up a few hours later with another tweet suggesting a deal was imminent.

Another expert, University of Maryland finance professor Steven Heston, reviewed an even denser report analyzing the impact of Musk’s tweets on more than 2,000 types of Tesla stock options, drawing largely upon a formula known as the Black-Scholes model widely used by companies to value executive compensation packages.

When pressed by a Musk lawyer about the reliability of his model, Heston acknowledged: “All models deviate from reality, which is why they are models.”

The mind-bending estimates laid out by two experts hired by attorneys representing Tesla shareholders underscored the challenges facing a nine-person jury as the three-week trial winds down this week. U.S. District Judge Edward Chen expects to turn the case over to the jury Friday.

Depending on the verdict, Musk and the electric automaker that he runs could be facing more financial fallout for his unpredictable behavior on the Twitter platform, which he now owns. Without acknowledging any wrongdoing, Musk and Tesla reached a $40 million settlement with securities regulators after Musk’s troublesome tweets in August 2018.

Gusts of wind up to 50 mph (80 kph) that sent trees into homes in Sonoma County on Saturday could reach 100 mph (160 kph) over Sierra ridgetops by early Sunday, the National Weather Service said.