English: CGM of FGM data are plotted by time ignoring date and subjected to smoothing using five frequency percentile curves: 10th, 25th, 50th (median), 75th and 90th. The top panel is a person with normal glucose metabolism. The center (50th percentile curve) dark line represents overall glucose exposure (mean 89mg/dL). The bottom panel is a person with type 1 diabetes (mean 134mg/dL). The AGP shows significant variability indicated by the darkened area on either side of the median (25th-75th percentile curves--known as inter-quartile range or IQR) is very wide when compared with the normal pattern in the top panel. The IQR represents the area in which 50% of the glucose values will fall. The lighter area on either side of the IQR represents the inter-decile range within which 80% of all values will fall (the area between 10th to 90th percentile curves).The target range, set between 70-180mg/dL, in the bottom panel shows that overnight and mid-afternoon there is a risk of hypoglycemia, while mid-day there is a risk of hyperglycemia. Additionally, while the median curve in the top panel is almost flat, in the bottom panel it oscillates, indicating unstable glucose levels.