Data for POINT shapefile was collected from: ASSESSMENT OF THE COAL RESOURCES OF THE KYRGYZ REPUBLIC: COAL CHARACTER AND DISTRIBUTION, GEOLOGY, MINING, AND IMPORTANCE TO THE NATION'S FUTURE USGS Open File Report 97-137A (English) Table 14. Ash fusion temperatures in both oxidizing and reducing atmosphere of coal samples. Free swelling index, Hardgrove Grindability, apparent specific gravity, and ash content (750°C) are listed for the samples. 1 Initial deformation temperature: The temperature at which the first rounding of the apex of the cone occurs. 2 Softening temperature: The temperature at which the cone has fused down to a spherical lump in which the height is equal to the width at the base. 3 Hemispherical temperature: The temperature at which the cone has fused down to a hemispherical lump at which point the height is one half of the width of the base. 4 Fluid temperature: The temperature at which the fused mass has spread out in a nearly flat layer with a maximum height of 1.6mm. http://energy.er.usgs.gov/products/openfile/OFR97-137A/index.htm