How to use airport panel information on sectional chart? In the Chart Supplement, the airport information includes the chart on which the airport is located. It also includes a panel on the chart where the airport is located. How can I use this panel information? Sectional charts don't appear to have panels.

Here is the airport information for San Francisco International:


I understand that San Francisco stands for San Francisco Sectional Chart and H-3B and L-2F are for the IFR charts, but how can I use the 3B and A information?
In addition to @JWalters's answer:
L-2F, 3B is one group, and it refers to the &quot;Enroute Low Chart Number(s) and Panel Identification&quot;,$^1$ that is:

L-2F, and
L-3B.

Since you are aware of the L-2F, here's the L-3B:

Source: skyvector.com

$^1$ Interagency Air Committee (IAC) Specifications, IAC 8, faa.gov, § 3.1.5.2.7