Which table provides required surface intervals before further ascent to altitude?

The correct choice is based on the specific function of Table 9-6, which is designed to provide necessary surface intervals before further ascent to altitude after a dive. This table is essential especially for divers who may be transitioning from underwater activities to altitude environments, as it helps to mitigate the risk of decompression sickness by recommending the appropriate waiting period needed for the body to eliminate nitrogen absorbed during diving.

By using this table, divers can ensure they are following safe practices and adhering to the guidelines critical for health and safety. It is important to take these surface intervals seriously, as they allow the body to adjust and prevent nitrogen bubbles from forming in the bloodstream when ascending to higher altitudes.