We sequenced 12 samples. Each sample is pooled from equal concentrations of 3 RNA samples (replicates) from leaves of soybean receiving the same treatment (Total 4 treatments with control).
typically, during the sample prep process to generate libraries for multiplex sequencing you would include a step to add a unique bar-code index to each sample to enable demultiplexing of each sample in a pool following sequencing.
without having barcoded at the first steps of the librairies preparation, it will be impossible to distinguish samples. You'll just have a mean signal for all expression data.