We identify a dayside electron diffusion region (EDR) encountered by the
Magnetospheric Multiscale (MMS) mission and estimate the terms in generalized
Ohm's law that controlled energy conversion near the X-point. MMS crossed the
moderate-shear (130 degrees) magnetopause southward of the exact X-point. MMS
likely entered the magnetopause far from the X-point, outside the EDR, as the
size of the reconnection layer was less than but comparable to the
magnetosheath proton gyro-radius, and also as anisotropic gyrotropic "outflow"
crescent electron distributions were observed. MMS then approached the X-point,
where all four spacecraft simultaneously observed signatures of the EDR, e.g.,
an intense out-of-plane electron current, moderate electron agyrotropy, intense
electron anisotropy, non-ideal electric fields, non-ideal energy conversion,
etc. We find that the electric field associated with the non-ideal energy
conversion is (a) well described by the sum of the electron inertial and
pressure divergence terms in generalized Ohms law though (b) the pressure
divergence term dominates the inertial term by roughly a factor of 5:1, (c)
both the gyrotropic and agyrotropic pressure forces contribute to energy
conversion at the X-point, and (d) both out-of-the-reconnection-plane gradients
(d/dM) and in-plane (d/dL,N) in the pressure tensor contribute to energy
conversion near the X-point. This indicates that this EDR had some
electron-scale structure in the out-of-plane direction during the time when
(and at the location where) the reconnection site was observed.