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Default same parameters but difference in phase why?

same parameters but difference in phase why?

hi, though this question seems to be easy for you but i am new for this software and to this field. Recently, i took silicon spectra in 500mhz(bruker) seems to be good (i.e.one silicon peak and one nmr tubes broad peak) but when i used same parameters for another sample where i got single peak as i expected but nmr tube peak is inverse this time. I just copied previous parameters only why i got such a inverse signal.If anybody know please help me.

thank you



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