The phrase "two separate clusters" is correct and usable in written English.
You can use it to refer to two distinct groups of things, people, or data points. For example, "We identified two separate clusters of galaxies in the survey."
The master bathroom suite has two separate clusters of rooms — including a vanity and dressing area — linked by a shower.
The Games will last for two weeks and take place in two separate clusters – one by the sea and one in the mountains.
Moreover, two separate clusters were identified within the group of counterfeit coins [6].
In the constructed phylogenetic tree, C1r and C1s formed two separate clusters, which further branched into groups of related organisms.
Two separate clusters can be identified in the scatter plot for cysts and for liver tissue for all sizes of liver lesions (Fig. 4e).
Woody cover closely paralleled population in a semi-urban watershed (R2 = 0.81) and two separate clusters of rural watersheds (R2 = 0.88 and 0.93), despite exhibiting very different directional trends over time in each setting.
The experimental data obtained using thermogravimetry (TG-DTG) allows us to differentiate all the fossil bone samples analyzed into two separate clusters and to interpret this differentiation in terms of the observed transitions.
To explore this idea fully, the intercluster distances were first obtained by computing the closest Euclidean distance between two tags belonging to two separate clusters [61]: dist ( C i, C j ) = min { d ( x, y ) : x ∈ C i, y ∈ C j } (7).
However, the experimental data obtained using thermogravimetry (TG-DTG), processed by chemometrics, allows us to differentiate all the fossil bone samples analyzed into two separate clusters, that were not so different from those obtained using the parameters proposed by G. Szoor [13], or Haas and Banewicz [15], but in any case better defined.
The deltaproteobacterial sequences fell into two separate clusters (Figure 6A).
Each data set was divided into two separate clusters based on the similarity of their layer-line patterns.
