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Frequently Asked Question - Why do cells in the trend/ threshold indicator matrix sometimes switch to grey?

Why do cells in the trend/ threshold indicator matrix sometimes switch to grey?

Cells in the trend/ threshold indictor matrix will switch to grey in the event that the concentration trend cannot be calculated because there is insufficient data, or if confidence in the trend smoother estimate is poor. Regions of poor confidence in the trend fit are indicated where the trend smoother and 95% confidence limit curves are coloured grey, rather than blue, on the well trend plot. Regions of poor confidence are defined as where the upper 95% confidence limit (dashed blue/ grey line) exceeds 10x the trend fit value (solid blue line).