Representative continuous lipoprotein density profile from a dog of group 1 (normolipemic dogs of breeds other than Miniature Schnauzers). Intensity refers to the number of pixels of fluorescence emission recorded. The x-axis provides the distance in mm from the top of the 33 mm ultracentrifuge tube. This dog had serum TAG and cholesterol concentrations within the respective reference intervals. The most abundant lipoprotein fractions are R7 and R8 (which correspond to a density for HDL), seen at a tube coordinate between 23 mm and 31 mm. R2 to R6 fractions (corresponding to LDL densities) are present in very small amounts and are seen at a tube coordinate between 9 mm and 23 mm. The R1 fraction (that corresponds to TRL densities) appears at tube coordinates of 6 mm to 9 mm in very small amounts.