  Gamma-ray observations of nearby radio-line-emitting gas structures in the
interstellar medium allow us to probe the spectrum of cosmic rays (CRs). In
this paper, we analysed Fermi Large Area Telescope (LAT) gamma-ray observations
of three such structures located near each other to check if their CR spectra
are compatible with that of the CR background or might provide evidence for a
population of "fresh" CRs. We found that the shape of the gamma-ray spectrum in
the Aquarius HI shell is consistent with the previously published stacked
gamma-ray spectrum of the Gould Belt molecular clouds. We also found that
assumptions on the diffuse Galactic gamma-ray background affect the spectral
shapes of CRs derived in the R Coronae Australis and rho Ophiuchi molecular
clouds in which spectral deviations had previously been suggested. These two
facts provide evidence to support the hypothesis of uniformity of the shapes of
cosmic ray spectra in the local Galaxy environment.
