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We need a clarification on MiCOM P14x - US standard inverse curve for Over current protection. for the time calculated by formula and the time seen on the curve

The difference between the time calculated by formula and the time seen on the curve is due to the P14x calculation. 
The TD seen on scheme curve is different from the one use in the P14x formula. 

Please, find attached 2 files : 
.Docx concerning an explanation between the formula Inside the P14x and the Us curve Standard. 
.Xlsx is a document showing the 2 curves; one with the formula from P14x and the second one with the Standard formula Us C02.
You can see the 2 curves are identical. 

You can also see the ratio between TD 'Standard' and the TD 'P14x' is 49. 
 
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