method        sample  d13C   d15N   molar_C_to_N  
Conventional  PLK1    -12.9  16.7   2.8           
Conventional  PLK2    -12.8  16.8   2.8           
Conventional  PLK3    -12.9  16.8   2.8           
Conventional  PLK4    -12.8  16.6   2.7           
Conventional  PLK5    -12.8  16.7   2.7           
Conventional  PLK6    -12.9  16.5   2.7           
Conventional  PLK7    -12.9  16.6   2.8           
Conventional  PLK8    -13.0  16.6   2.8           
Conventional  PLK9    -13.1  16.5   2.8           
Conventional  PLK10   nd     16.6   2.9           
Raw           Raw1    -13.0  16.5   3.0           
Raw           Raw2    -13.1  16.7   2.9           
Raw           Raw3    -12.7  16.6   2.9           
Raw           Raw4    -12.7  16.5   2.9           
Raw           Raw5    -12.6  16.6   2.9           
Raw           Raw26   -12.8  16.7   2.9           
Raw           Raw27   -13.0  16.6   3.0           
Raw           Raw28   -12.9  16.6   2.9           
Raw           Raw29   -13.0  16.6   2.9           
Raw           Raw30   -13.0  16.6   3.0