code: func (c *ChainIndexer) Sections() (uint64, uint64, common.Hash) {
  	c.lock.Lock()
  	defer c.lock.Unlock()
  
  	return c.storedSections, c.storedSections*c.sectionSize - 1, c.SectionHead(c.storedSections - 1)
  }
docs: // Sections returns the number of processed sections maintained by the indexer
  // and also the information about the last header indexed for potential canonical
  // verifications.