So it looks like you don’t have an (“enzo”, “Metal_Density”) field, so the gas metallicity field is not present in the output you’re looking at. You do have the primordial species fields, but no metals. Your star particles do have a metallicity field thoughz

On Sat, Dec 8, 2018 at 9:33 AM <up765045@myport.ac.uk> wrote:
The contents of ds.field_list:

('all', 'creation_time')
('all', 'dynamical_time')
('all', 'metallicity_fraction')
('all', 'particle_index')
('all', 'particle_mass')
('all', 'particle_position_x')
('all', 'particle_position_y')
('all', 'particle_position_z')
('all', 'particle_type')
('all', 'particle_velocity_x')
('all', 'particle_velocity_y')
('all', 'particle_velocity_z')
('enzo', 'Dark_Matter_Density')
('enzo', 'Density')
('enzo', 'Electron_Density')
('enzo', 'GasEnergy')
('enzo', 'H2II_Density')
('enzo', 'H2I_Density')
('enzo', 'H2I_kdiss')
('enzo', 'HII_Density')
('enzo', 'HI_Density')
('enzo', 'HI_kph')
('enzo', 'HM_Density')
('enzo', 'HeIII_Density')
('enzo', 'HeII_Density')
('enzo', 'HeII_kph')
('enzo', 'HeI_Density')
('enzo', 'HeI_kph')
('enzo', 'PhotoGamma')
('enzo', 'SN_Colour')
('enzo', 'Temperature')
('enzo', 'TotalEnergy')
('enzo', 'x-velocity')
('enzo', 'y-velocity')
('enzo', 'z-velocity')
('io', 'creation_time')
('io', 'dynamical_time')
('io', 'metallicity_fraction')
('io', 'particle_index')
('io', 'particle_mass')
('io', 'particle_position_x')
('io', 'particle_position_y')
('io', 'particle_position_z')
('io', 'particle_type')
('io', 'particle_velocity_x')
('io', 'particle_velocity_y')
('io', 'particle_velocity_z')
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