# F—Fill Factor > [!note] 이 페이지는 아직 한국어로 번역되지 않아 영어로 표시됩니다. The Fill Factor index represents the ratio of the mean hill size to the mean cell size, expressed as a percentage. It provides a measure of how much of the cell area is occupied by hills, indicating the density of the elevated structures on the surface or distance between structures.