Explaination of thermocouple chart ?

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In a thermocouple chart, the Y-axis indicates the temperature of the measurement junction, while the X-axis represents the temperature of the reference junction. The reference junction temperature is depicted only up to 10°C, which may seem limited but is sufficient for many applications. Both axes are temperature scales, with rows increasing in steps of 10°C and columns in steps of 1°C. To find the voltage at a specific temperature, such as -255°C, one must locate the corresponding row and column in the chart. Understanding this layout is crucial for accurate thermocouple readings and voltage conversions.
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The Y axis represents the temperature of the measurement junction in a thermo couple chart and what does the X axis represents ?

http://www.pyromation.com/downloads/data/emfk_c.pdf. This is a chart for K type thermocouple.

Does it represent the temperature of the refernce junction , if yes then why only till 10 deg C.
 
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Both axes are temperature: The rows are steps of 10 and the columns are steps of 1.

If you want to know the voltage at -255°C, you have to look in row "-250°C" and column "5" and get -6.425mV.
 

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