Nickel 500 and 200 ohms at 0 Celsius
you can calculate the Tables by using this formula for Ni xxx:


= 100Ω for Ni100, 500Ω for Ni500 and so on.  

t = temperature in °C
A = 5,485∙10^(−3) °C^(-1);
B = 6,65∙10^(−6) °C^(−2); 
C = 2,805∙10^(−11) °C^(−4); 
D = −2∙10^(−17) °C^(−6).


For Ni 500 you will get this: 



source is the german wikipedia article. (the english one does not have it)