Section \[sec:Conclusions\]. Because of the large number of mathematical quantities defined in this paper, we provide a glossary of important symbols for the reader’s convenience in Table \[tab:Definitions\].

  Quantity                                          Meaning/Definition                                                                                                  Context
  ------------------------------------------------- ------------------------------------------------------------------------------------------------------------------- -----------------------------------------------------
  $\mathbf{r}$                                      Comoving position                                                                                                   Section \[sec:Intro\]
  $\mathbf{\hat{r}}$                                Angular direction unit vector                                                                                       Section \[sec:Intro\]
  $\mathbf{r}_\perp$                                Comoving transverse distance                                                                                        Eq.
  $r(\nu)$ or $r_\nu$                               Comoving radial distance                                                                                            Eq.
  $s(r)$                                            Incorrect radial distance assumed for true radial distance $r$ due to interloper lines                              Eq.
  $\nu(r)$ or $\nu_r$                               Observed frequency of radio emission                                                                                Section \[sec:Notation\]
  $\alpha$                                          Linearized conversion factor between frequency and radial comoving distance                                         Eq.
  $ \boldsymbol \theta$                             Sky image angle                                                                                                     Eq.
  $\mathbf{k}$                                      Wavevector of rectilinear spatial Fourier modes                                                                     Section \[sec:Intro\]
  $k_\perp$                                         Magnitude of wavevector components perpendicular to line of sight                                                   Section \[sec:Intro\]
  $k_\parallel$                                     Magnitude of wavevector components parallel to line of sight                                                        Section \[sec:Intro\]
  $k$                                               Total wavenumber/wavevector magnitude of rectilinear spatial Fourier modes                                          Section \[sec:Intro\]
  $\phi(\mathbf{r})$                                Survey volume selection function                                                                                    Section \[sec:FiniteVolume\]
  $\phi(r)$                                         Radial survey profile or survey volume selection function assuming full-sky covarage                                Section \[sec:FiniteVolume\]
  $\Phi(r)$                                         Radial survey profile centered on radial midpoint of survey                                                         Section \[sec:MostlyRadialNoInterferometry\]
  $T(\mathbf{r})$ or $T({\hat{\mathbf{r}}}, \nu)$   Sky temperature in configuration space                                                                              Eq.
  $ \overline{T}_{\ell m} (k)$                      Sky temperature in spherical Fourier-Bessel space                                                                   Eq.
  $ 