$M_{p\eta}$ invariant mass distribution for $E_\gamma$ = 1400-1500 MeV.

$M_{p\eta}$ invariant mass distribution for $E_\gamma$ = 1500-1600 MeV.

$M_{p\eta}$ invariant mass distribution under the conditions: $E_\gamma$ = 1400-1500 MeV; 1120 MeV $\leq M_{p\pi^0} \leq$ 1220 MeV; $\theta_p^{lab} \leq$ 25°; 25° $\leq \theta_\gamma^{lab} \leq$ 155°.

$M_{p\eta}$ invariant mass distribution under the conditions: $E_\gamma$ = 1400-1500 MeV; 1120 MeV $\leq M_{p\pi^0} \leq$ 1220 MeV; $\theta_p^{lab} \leq$ 25°; 1° $\leq \theta_\gamma^{lab} \leq$ 155°.

$M_{p\eta}$ invariant mass distribution for $E_\gamma$ = 1400-1500 MeV and $M_{p\pi^0} \leq$ 1190 MeV, allowing for all proton and photon laboratory angles.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1170 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1180 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1200 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1210 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1220 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1400-1420 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1460 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1460-1500 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1500-1540 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1540-1600 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

$M_{p\eta}$ invariant mass distribution for the incident photon energy range $E_\gamma$ = 1420-1540 MeV and $M_{p\pi^0} \leq$ 1190 MeV.

Excess yield relative to the PWA distributions in the invariant mass distributions $M^2_{p\eta}$.

Excess yield relative to the PWA distributions in the invariant mass distributions $M^2_{\pi^0\eta}$.

Excess yield relative to the PWA distributions in the invariant mass distributions $M^2_{p\pi^0}$, with a cut on the structure in the $M^2_{p\eta}$ invariant mass distribution.

Excess yield relative to the PWA distributions in the $p-\eta$ opening angle distribution in the $\gamma p$ centre-of-mass system.

Excess yield relative to the PWA distributions in the $p-\eta$ opening angle distribution in the $\gamma p$ centre-of-mass system.

Excess yield relative to the PWA distributions in the $\pi^0-\eta$ opening angle distribution in the $\gamma p$ centre-of-mass system.

Excess yield relative to the PWA distributions in the $\pi^0-\eta$ opening angle distribution in the $\gamma p$ centre-of-mass system.

Differential cross section $d\sigma/dM_{\pi^0\eta}$ for $E_\gamma$ = 1540-1600 MeV.

$M_{p\eta}$ invariant mass distribution, taken as difference to the PWA calculations (s. Fig. 11).

$M_{\pi^0\eta}$ invariant mass distribution, taken as difference to the PWA calculations (s. Fig. 11).

$\theta_{p\eta}$ opening angle distribution, taken as difference to the PWA calculations (s. Fig. 12).

$\theta_{\pi^0\eta}$ opening angle distribution, taken as difference to the PWA calculations (s. Fig. 12).

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1642 to 1770 MeV.

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1770 to 1898 MeV.

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1898 to 1994 MeV.

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1642 to 1770 MeV.

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1770 to 1898 MeV.

Measured beam asymmetry I_S as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1898 to 1994 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the proton as the recoiling particle for the cm energy range 1642 to 1770 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the proton as the recoiling particle for the cm energy range 1770 to 1898 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the proton as the recoiling particle for the cm energy range 1898 to 1994 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1642 to 1770 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1770 to 1898 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the pi0 as the recoiling particle for the cm energy range 1898 to 1994 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1642 to 1770 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1770 to 1898 MeV.

Measured beam asymmetry I_C as a function of the angle between the reaction plane and the plane of the two final state particles with the the eta as the recoiling particle for the cm energy range 1898 to 1994 MeV.

Differential cross sections as a function of the angles of the individual final state particles for the W range 2.1 to 2.5 GeV.. Errors shown are statistical only.

Differential cross sections as a function of the angles of combinations of final state particles for the W range 1.7 to 1.9 GeV.. Errors shown are statistical only.

Differential cross sections as a function of the angles of combinations of final state particles for the W range 1.9 to 2.1 GeV.. Errors shown are statistical only.

Differential cross sections as a function of the angles of combinations of final state particles for the W range 2.1 to 2.5 GeV.. Errors shown are statistical only.