The phrase "first two peaks" is correct and usable in written English.
You can use it to refer to the first two highest points of a graph, mountain range, or other set of data. For example, "We can see from the graph that the first two peaks represent the highest values."
The drive frequencies required to cause bifurcation correspond to the first two peaks in the system's frequency response curve.
These match each of the three image datasets and the first two peaks can also be found in the nitrogen adsorption data.
The first two peaks happened to coincide with pneumatic transfer pipes in the pool, but the third peak happened to be in line with the slant tube position.
The first two peaks of pheomelanin as well as all those of eumelanin are located within the fingerprint region of the Raman spectrum; they are therefore unlikely to offer a straightforward route to highly specific detection of melanin pigment subtypes in the native context of human skin, as vibrational peaks from other chemical species would result in spectral interference.
The first two peaks at ~100.5 and ~101.0 eV are the Si doublet, as expected.
From Table 1, and from Figure 9a, the first two peaks are at (6.02,9.41) in meters.
For instance, the first two peak frequencies of rotating flexible wheelset appear at 67 and 135 Hz.
The crystal size was measured from the first three peaks of the respective X-ray diffractogram.
The first three peaks at r ≈ 0.4, 0.8, 1.2 σ0 correspond to neighbouring molecules stacked in the same column (face-face).
The first three peaks are attributed to characteristic peaks of S2−, S22−, and S n 2−, respectively, indicating the presence of S− and S2−.
All samples were found to contain the first three peaks but varied in the latter two, containing 378 and/or 385 cm−1.
