$\backslash$table$[[857,860,865,872,867,865,877],[860,868,882,885,882,872,883],[865,881,891,894,893,882,882],[871,888,895,902,902,891,882],[873,882,894,905,912,897,890],[876,882,891,895,906,900,893],[882,888,892,895,906,905,897],[885,895,900,902,911,909,903]]$

Counter interval $-5^{\text{'}}$This is a topographical map for Elementary surveying engineering class. It is asking to put counter interval of $5\text{'}$