<prompt> Bhala okuqhubekayo kwalesi sigaba - Ibalazwe lokusabalalisa amaphuzu libeka izimpawu zamaphoyinti amancane esikhaleni esinikeziwe ukukhombisa ukusatshalaliswa kwesimo esithile. Indawo yephuzu ngalinye ingase imelele indawo yangempela yesenzakalo esisodwa, njengoba kunjalo ebalazweni elenziwe uDkt. Snow phakathi nokuqubuka kwekholera ngo-1854 eBroad Street  <response>: , lapho ichashazi ngalinye lalimelela ukufa okukodwa ngenxa yekholera. Ngenye indlela, idatha yezibalo ezihlanganisiwe ezifanayo ezisetshenziswa kumamephu we-choropleth zingabekwa ngokubeka amachashazi endaweni ngayinye yokuhlanganisa isb., izwe, izwe, isifunda ukukhombisa ubukhulu obujwayelekile bezimo; leli fomu lokugcina livame ukubizwa ngokuthi imephu yobuningi bamachashazi. 