Explaination of thermocouple chart ?

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SUMMARY

The discussion focuses on the interpretation of a K type thermocouple chart, specifically addressing the axes' representations. The Y axis indicates the temperature of the measurement junction, while the X axis represents the temperature of the reference junction, limited to a range of up to 10°C. The chart allows users to find the corresponding voltage for specific temperatures, exemplified by locating -6.425mV at -255°C by referencing row "-250°C" and column "5".

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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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