What does the Q-line mean in the javelin throwing area of the World Track and Field Championships?

Only in the passing game, according to the level of the world javelin competition in that year, it is different every year.

Olympic track and field events are usually divided into two groups, and those who pass the standard will go straight to the finals. If the number of athletes who meet the passing standards is less than 12, the insufficient number will be replenished according to the passing results. The order of the first three rounds from the final of the project is decided by drawing lots.

After the first three rounds of the final, the top eight athletes will be selected for the final three rounds according to the results; The fourth and fifth rounds are sorted in reverse order according to the results of the first three rounds, and the sixth round is sorted in reverse order according to the results of the first five rounds, with the best results jumping (throwing) at the end.

In throwing events, except for foul, it is only effective when the throwing equipment of the athlete completely falls within the landing area (excluding the sideline of the landing area), and the gun head should land before the gun tail. When measuring the results, it is calculated from the nearest landing point to the throwing area. Among them, javelin must be effective if the tip touches the ground first.