lepton and photon isolation variable definition

[HDelpheser]

Dear experts,

I am using Delphes 3.4.2. As I read through the Delphes manual ​https://arxiv.org/pdf/1307.6346.pdf, the isolation variable is defined as the ratio of the sum of transverse momenta of all particles in a cone around the particle of interest P except P to the transverse momentum of P. The input particle collection for sum in the numerator can be freely set by the user. My question is that what (precisely) are the input particle collections used for isolating photons, muons and electrons?

Thanks in advance for your help