code: public PESection loadSection(int sectionNr) {
          Preconditions.checkArgument(
                  sectionNr > 0 && sectionNr <= table.getNumberOfSections(),
                  "invalid section number");
          SectionHeader header = table.getSectionHeader(sectionNr);
          return loadSectionFrom(header);
      }
docs: Loads the section that has the sectionNr.
  <p>
  This does not instantiate special sections. Use methods like
  {@link #loadImportSection()} or {@link #loadResourceSection()} instead.
  
  @param sectionNr
  the section's number
  @return {@link PESection} instance of the given number
  @throws IllegalArgumentException
  if invalid sectionNr