# HACK for test reports: complete some days with a few NAs, for nicer graphics
			nas_in_serie = is.na(data$getSerie(today))
			if (any(nas_in_serie))
			{
				if (sum(nas_in_serie) >= length(nas_in_serie) / 2)
					return (NA)
				for (i in seq_along(nas_in_serie))
				{
					if (nas_in_serie[i])
					{
						#look left
						left = i-1
						while (left>=1 && nas_in_serie[left])
							left = left-1
						#look right
						right = i+1
						while (right<=length(nas_in_serie) && nas_in_serie[right])
							right = right+1
						#HACK: modify by-reference Data object...
						data$data[[today]]$serie[i] <<-
							if (left==0) data$data[[today]]$serie[right]
							else if (right==0) data$data[[today]]$serie[left]
							else (data$data[[today]]$serie[left] + data$data[[today]]$serie[right]) / 2.
					}
				}
			}